Dictionary/API

API (Application Programming Interface)

A set of protocols, routines, and tools that allows different software applications to communicate and interact with each other.

An Application Programming Interface (API) acts as an intermediary layer that enables different software systems to exchange data and functionality. Think of it as a waiter in a restaurant - you don't need to know how the kitchen works, you just order through the waiter (API) and receive your food (data).

Key Components

  • • Endpoints: Specific URLs where data can be accessed
  • • Methods: GET, POST, PUT, DELETE operations
  • • Authentication: API keys or tokens
  • • Response Format: Usually JSON or XML
  • • Rate Limits: Usage restrictions
  • • Documentation: How to use the API
  • • Error Handling: Status codes and messages
  • • Versioning: API version management

Example

E-commerce Platform Integration: Your startup builds a marketplace app
• Uses Stripe API for payment processing
• Integrates Google Maps API for location services
• Connects to SendGrid API for email notifications
• Links with social media APIs for user authentication
Instead of building payment, mapping, email, and authentication systems from scratch, APIs allow your startup to leverage existing services and focus on core business logic.

Related Terms

REST API

Representational State Transfer

Microservices

Architectural pattern using APIs

SaaS

Software as a Service

Integration

Connecting systems via APIs