What is the difference between RESTful APIs and WebSockets?

A RESTful API is an architectural style for an application program interface (API) that uses HTTP requests to access and use data. That data can be used to GET, PUT, POST, and DELETE data types, which refers to the reading, updating, creating, and deleting of operations concerning resources.
A WebSocket is a persistent connection between a client and a server. WebSockets provide a bidirectional, full-duplex communications channel that operates over HTTP through a single TCP/IP socket connection. At its core, the WebSocket protocol facilitates message passing between a client and server.
In short, our RESTful APIs require you to send a request and wait for a response. Our WebSockets are an open connection streaming data from our servers to your client without any delays.