An API (application programming interface) is a defined contract that lets one piece of software request data or actions from another. It hides internal details behind agreed operations, inputs and responses.
An API gateway is a service that sits in front of a set of APIs as a single entry point. It routes requests and handles shared concerns such as authentication, rate limiting, logging and transformation.
GraphQL is a query language and runtime for APIs that lets clients ask for exactly the fields they need from a typed schema. Requests usually go through a single endpoint instead of several fixed URLs.
A REST API is a web interface that exposes resources at URLs and uses standard HTTP methods to read and change them. GET, POST, PUT and DELETE map to reading, creating, replacing and removing data.
A software development kit (SDK) is a packaged set of libraries, tools, documentation and samples for one platform or service. It saves developers from building integrations from scratch.
The Agent2Agent protocol is an open standard for AI agents to discover each other and delegate tasks. Agents built by different teams or vendors can then exchange work through one common interface.
The backend is the server-side part of an application that users do not see. It holds business logic, data storage, integrations and security, and serves the front end and other systems through APIs.
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