What is marker?

An API, or Application Programming Interface, is a set of rules and tools that lets different software programs talk to each other. Think of it like a menu in a restaurant: the menu lists what you can order, and the kitchen (the software) knows how to prepare it. The API tells you how to request something and what you’ll get back.

Let's break it down

  • Endpoint: The specific URL where you send a request (like a phone number you call).
  • Request: The message you send, often including data and a method (GET, POST, etc.).
  • Response: The answer you receive, usually in a format like JSON or XML.
  • Authentication: A way to prove who you are, such as an API key or token.
  • Rate limiting: Rules that limit how many requests you can make in a certain time.

Why does it matter?

APIs let developers build new apps faster by reusing existing services (maps, payments, weather data, etc.). They enable different systems-like a mobile app and a web server-to work together smoothly, creating richer experiences for users without reinventing the wheel.

Where is it used?

  • Social media platforms (Twitter, Facebook) let other apps post updates via their APIs.
  • Payment gateways (Stripe, PayPal) use APIs to process transactions.
  • Weather services provide forecast data through APIs.
  • Smart home devices communicate with each other using APIs.
  • Any modern web or mobile app that pulls data from another service.

Good things about it

  • Speed: Build features quickly by leveraging existing services.
  • Scalability: Services can grow independently; the API remains the same.
  • Flexibility: Different platforms (iOS, Android, web) can all use the same API.
  • Innovation: Developers can combine multiple APIs to create new, unique products.
  • Maintenance: Updates to the backend can happen without changing the client code, as long as the API contract stays stable.

Not-so-good things

  • Dependency: If the API provider changes or goes down, your app can break.
  • Security risks: Poorly designed APIs can expose data or be vulnerable to attacks.
  • Rate limits: You may be restricted on how many requests you can make, affecting performance.
  • Versioning headaches: Managing multiple API versions can become complex.
  • Latency: Each API call adds network delay, which can slow down the user experience.