REST? HATEOAS? HAL?

tl;dr: The basis for almost all modern web-based APIs.

Representational state transfer

https://en.wikipedia.org/wiki/Representational_state_transfer

Hypermedia As The Engine Of Application State

https://en.wikipedia.org/wiki/HATEOAS

Hypertext Application Language

https://en.wikipedia.org/wiki/Hypertext_Application_Language