---
title: "API"
url: "https://docs.unified.to/concepts/glossary/api"
description: "Unified.to documentation"
generated_at: "2026-05-21T18:12:26.867Z"
---
# Glossary: API[Glossary](/concepts/glossary)

An **API** is a set of rules and protocols for two applications to communicate with each other, allowing them to interact and share data using a defined set of methods and data formats.

APIs provide an interface made of endpoints — URLs or URIs, each of which correspond to a specific operation to be performed on a specific resource, such as retrieving data, updating data, and deleting data. The client application makes requests to the API to perform an operation or provide data; the server application performs the API’s services and issues responses to the client’s requests.

Requests are made using HTTP methods, with each method specifying a different kind of action to be performed the resource at the endpoint:

* GET: Retrieve one or more resources from the server.
* POST: Send data to the server to create a new resource.
* PUT: Update an existing resource on the server.
* DELETE: Remove a resource from the server.