# Presets > Every ready-made part on the library's Presets shelf, with its kind and what it is. The library’s **Presets** shelf has 117 parts ready to go. A preset fills in a part’s kind, name, drawing, card, technology and starting limits; everything it fills in can be changed after. See [start from a preset](https://docs.flozu.app/guides/looks.md#start-from-a-preset). ## People and apps | Preset | Kind | What it is | | ------------------- | ------------------------------ | -------------------------------------------- | | Customers | Person | The people who use what you make. | | Admins | Person | The people who run things behind the scenes. | | Support team | Person | The people who help customers. | | On call | Person | Whoever answers when something breaks. | | Web app React | Client app | A website people use in their browser. | | iPhone app iOS | Client app | An app on people's iPhones. | | Android app Android | Client app | An app on people's Android phones. | | Desktop app | Client app | An app people install on their computer. | | Tills | Client app | The tills in a shop, taking payments. | | Sensors | Client app | Devices that send readings on their own. | | Partner integration | Client app run by someone else | Another company's system calling your API. | ## The way in | Preset | Kind | What it is | | -------------------------- | --------------------------- | -------------------------------------------------------- | | Cloudflare DNS Cloudflare | DNS | Turns your domain into the addresses traffic goes to. | | Route 53 | DNS | DNS that moves traffic away from a failed site. | | Cloudflare CDN Cloudflare | CDN | Serves your pages and files from close to people. | | CloudFront | CDN | A CDN that keeps most traffic off your servers. | | Web firewall AWS WAF | Firewall | Blocks attacks and bad requests before they reach you. | | DDoS protection Cloudflare | Firewall | Soaks up floods of traffic meant to take you down. | | Bot protection | Firewall | Lets people in and turns bots away. | | VPN Tailscale | Firewall | A private way in for your own team. | | API gateway Kong | Gateway | Checks every call to your API and routes it. | | GraphQL gateway GraphQL | Gateway | One query that gathers answers from several services. | | Reverse proxy NGINX | Gateway | One front door in front of your servers. | | Service mesh Istio | Gateway | Carries and secures the calls between your services. | | Load balancer ALB | Load balancer | Shares traffic between healthy copies of a service. | | HAProxy | Load balancer | Hands requests to each server in turn. | | Token bucket limiter | Rate limiter | Lets bursts through, then settles to a steady rate. | | Per-user limit Redis | Rate limiter | Caps how often one person can call in a minute. | | API quota | Rate limiter | A daily allowance for each customer's calls. | | Auth0 sign-in Auth0 | Sign-in run by someone else | Sign-in run for you, with passwords and social logins. | | Passkey sign-in | Sign-in | Signs people in with their device, and no password. | | Keycloak | Sign-in | Your own sign-in, handing out tokens to the other parts. | ## Compute | Preset | Kind | What it is | | ---------------------------------- | --------- | ---------------------------------------------------------- | | REST API Node.js | Service | An API answering requests on a set of routes. | | Web server Next.js | Service | Builds and serves your web pages. | | Checkout service Go | Service | Takes a basket and turns it into an order. | | Orders service | Service | Tracks each order from placed to shipped. | | Kubernetes service Kubernetes | Service | A service in pods that scale out as traffic grows. | | Container Docker | Service | A service packed in a container. | | Background worker Sidekiq | Worker | Works through jobs from a queue. | | Celery worker Celery | Worker | A pool of Python workers taking tasks. | | Video encoder | Worker | Turns each upload into the sizes people stream. | | Workflow engine Temporal | Worker | Runs long jobs step by step, and picks up after a failure. | | Image resizer Lambda | Function | Makes every size of a picture when it's uploaded. | | Webhook handler Cloudflare Workers | Function | Takes in events other companies send you. | | Edge function Cloudflare Workers | Function | Small code that runs close to people. | | Nightly export Cron | Scheduler | Starts an export every night. | | Reminders | Scheduler | Sends reminders when they're due. | | Data pipeline Airflow | Scheduler | Runs data jobs in order on a timetable. | ## AI | Preset | Kind | What it is | | ---------------- | ---------------------------- | -------------------------------------------------- | | Claude | AI model run by someone else | A language model that answers, writes and reasons. | | AI agent | AI model | A model that uses tools to get a task done. | | Embeddings model | AI model | Turns text into numbers that capture its meaning. | | Knowledge base | Search | Finds the passages a model needs to answer. | | Vector database | Search | Finds the closest matches by meaning. | | Recommendations | AI model | Picks what to show each person next. | | Moderation | AI model | Checks posts and holds back the harmful ones. | | Fraud check | AI model | Scores each payment and holds the risky ones. | | Speech to text | AI model | Turns voice into text as people speak. | ## Messaging | Preset | Kind | What it is | | --------------------- | ------ | -------------------------------------------------------------------- | | SQS queue SQS | Queue | Holds jobs until a worker is free. | | RabbitMQ | Queue | Shares messages out between its consumers. | | Priority queue | Queue | Lets urgent work go first. | | Dead-letter queue | Queue | Keeps messages that keep failing, to look at later. | | Kafka topic Kafka | Topic | A log of events, split into partitions. | | Event bus EventBridge | Topic | Carries events from the parts that publish to the parts that listen. | | Pub/Sub topic Pub/Sub | Topic | Copies each event to every subscriber. | | Outbox | Worker | Sends each saved change on as an event, so none is lost. | ## Data | Preset | Kind | What it is | | --------------------------- | -------------------------- | --------------------------------------------------- | | PostgreSQL | Database | A relational database for your records. | | Read replica PostgreSQL | Database | A copy of the database that takes the reads. | | MySQL | Database | A relational database of tables and rows. | | MongoDB | Database | A database of documents. | | DynamoDB | Database | A key-value table that scales by itself. | | Graph database Neo4j | Database | Keeps records and how they relate. | | Time series database | Database | Keeps readings over time. | | Ledger PostgreSQL | Database | Records every movement of money, always in balance. | | Redis cache Redis | Cache | Keeps popular data in memory. | | Session store Redis | Cache | Remembers who's signed in. | | Memcached | Cache | A memory cache that drops the oldest keys first. | | Elasticsearch | Search | Finds records by their words. | | Algolia | Search run by someone else | Search as you type, run for you. | | S3 bucket S3 | Storage | Keeps files of any size. | | Media storage Cloud Storage | Storage | Keeps the photos people upload. | | Video library | Storage | Keeps videos ready to stream. | | Backups Backblaze | Storage | A copy of everything, taken every night. | | Snowflake | Data warehouse | Gathers data from everywhere for reports. | | BigQuery | Data warehouse | A warehouse you ask questions of in SQL. | | ClickHouse | Data warehouse | Fast analytics over lots of events. | | ETL job | Worker | Copies data from your systems into the warehouse. | ## Outside services | Preset | Kind | What it is | | --------------------------- | --------------------------- | ----------------------------------------------------- | | Stripe payments Stripe | Service run by someone else | Takes card payments for you. | | PayPal | Service run by someone else | Lets people pay with PayPal. | | Shopify | Service run by someone else | A shop run for you, with its cart and checkout. | | Email sending SendGrid | Service run by someone else | Sends your emails and tracks them. | | Text messages Twilio | Service run by someone else | Sends text messages to people's phones. | | Push notifications Firebase | Service run by someone else | Sends notifications to people's phones. | | Delivery tracking | Service run by someone else | A courier's service for sending and tracking parcels. | ## Operations | Preset | Kind | What it is | | --------------------- | ------------------------------- | -------------------------------------------------- | | Monitoring Datadog | Custom part run by someone else | Watches your systems' requests, errors and speed. | | Error tracking Sentry | Custom part run by someone else | Collects the errors your apps hit. | | Logs | Custom part | Gathers what every part writes down. | | Dashboards Grafana | Custom part | Charts of how everything is doing. | | Feature flags | Service | Turns features on for some people before everyone. | | Build pipeline | Custom part | Builds, tests and ships each change. | | Secrets vault | Custom part | Keeps passwords and keys out of the code. | ## Inside a service | Preset | Kind | What it is | | -------------------------------- | --------- | -------------------------------------------------------------------------- | | HTTP routes Express | Endpoint | The routes a service answers, such as POST /payments. | | GraphQL resolver GraphQL | Endpoint | Answers one field or mutation of a GraphQL API. | | gRPC method gRPC | Endpoint | One method other services call over gRPC. | | Webhook route | Endpoint | The route inside a service that takes in events another company sends. | | Module | Module | A part of the code with one job, such as billing or accounts. | | Domain logic | Module | The rules of the business, kept apart from how they're reached and stored. | | Data access | Module | The code that reads and writes the service's records. | | Source file TypeScript | Code file | One file of code, named by its path. | | Entry file TypeScript | Code file | Where the service starts, wiring the other parts together. | | Tests Vitest | Code file | The tests that check a part of the code still works. | | Interface TypeScript | Interface | A promise in code that other code keeps, such as a TypeScript interface. | | API spec OpenAPI | Interface | The written contract of an API, which clients and the service both follow. | | Protobuf schema Protocol Buffers | Interface | The messages and methods of a gRPC service. | | npm package npm | Library | A package the code is built on, from npm. | | Payments SDK Stripe | Library | The library a service calls a payment provider with. | | ORM Prisma | Library | Turns rows in a database into objects in code. | | Table | Table | One table in a database, where a service keeps its records. | | Table with columns | Table | A table drawn with its columns and their types. |