What is an API?
An Application Programming Interface (API) is a particular set of rules ('code') and specifications that software programs can follow to communicate with each other. It is a software intermediary that allows two applications to talk to each other.
A List of Free to Use APIs at GitHub
REST stands for Representational State Transfer.
You have an endpoint URL that you can send data to via querystrings.
Apigee API Management from Google - An API management solution from Google that helps companies with implementing their APIs and building modern applications quickly.
ProgrammableWeb.com - For general information about APIs and a directory of APIs available.
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