REST API

1. Develops APIs to enable client-server interaction.
2. Uses web services and is based on request and response.
3. Format of data is based on HTTP.
4. This consumes minimum bandwidth.
5. GET,POST,PUT,DELETE MEthod

RESTFull API

1. Web application follows REST architecture, providing interoperability between different systems.
2. Working is completely based on REST applications.
3. Format of data is based on HTTP, text, and JSON.

SOAP :
Simple Object Access Protocol (SOAP) helps define messages exchanged between systems and used by applications.
In contrast to REST, SOAP is an actual protocol that provides you with stricter detail about what an API does.
it provides a solid foundation for enterprise resources integrations.