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There are four main kind of operations when working with a database: Create, Read, Update and Delete (CRUD). However, databases are usually not exposed directly to the clients. Instead, those operations are performed by a server side application with a client-facing API. The most common type of APIs nowadays are based on HTTP. An HTTP API can be built with complete freedom. However, guidelines for best-practice HTTP API design have been created. An API following those guidlines is called a REST (or RESTful) API.