Originally an acronym, Asynchronous JavaScript and XML, allows the client to send & retrieve data from the server without reloading the page.

Programming Interfaces enable software to interact with other software through exposed functionality.

An authorization code passed in to an API request via a header or parameter to identify the requester.

Identifying the user of the API. Common techniques for authentication include API Keys and OAuth.

Cross Origin Requests allow javascript in websites to do AJAX requests to domains beyond the one initiating the request.

A collection of responses that are reused by the client to improve performance.

The client is the initiating party that sends an API request. Often times there will be many clients consuming the same API.

An API resource that groups other resources together.

The HTTP method for deleting resources with a RESTful API.

The Document Object Model defines a standard way to represent and interact with objects within both HTML & XML documents.