What is REpresentational State Transfer (REST)?

REpresentational State Transfer (REST) is an architectural style for development that emphasizes a uniform interface between components. It is designed to optimize data transfer at scale across the Internet through a series of guiding principles and constraints.

What can we use REST for? 

REST is generally used today in REST APIs and other web service development through existing Hypertext Transfer Protocols (HTTPs.) RESTful development makes it easier to scale web services on the client- or server- side to make web-based requests. Developers can use REST APIs to create complex queries that meet specific web service or application deployment needs.