API Gateway
Application Programming Interface Gateway
A server that consolidates multiple APIs into a single entry point, handling routing and traffic management.
In Simple Terms
An API Gateway is a system that manages access to multiple services through a single entry point. For example, when a mobile app displays news, weather, and stock prices all at once, contacting each server separately would scatter requests everywhere. Instead, the API Gateway acts as a central desk: it receives all requests from the app and routes each one to the right server. It also plays a gatekeeper role, verifying who is allowed to access each service.
Behind the Name
The name combines "API" — the interface through which programs exchange data — and "Gateway," meaning an entrance or passage. Just as a grand entrance hall gathers many separate doorways into one welcoming space, an API Gateway unifies multiple API endpoints into a single, well-managed entry point.
Take a Closer Look!
An API Gateway is a server that consolidates multiple APIs into one place, handling routing and security checks on your behalf.
Online services are often built from many small programs working together. An API Gateway unifies the entry points to those programs, so developers and users always know exactly where to go.
One of its main roles is routing — determining which program an incoming request is meant for and delivering it to the right destination.
This means that no matter how complex the system behind the scenes becomes, users only need to know a single entry point.
It also handles authentication to protect security, and can limit the volume of traffic flowing through.
Suspicious access can be blocked at the door, and sudden spikes in requests can be throttled to prevent servers from being overwhelmed.
In simple terms, think of it like a large building with many back entrances — an API Gateway adds a proper front desk with a capable receptionist.