What it is and the problem it solves
REST is a software architectural style created to describe and guide the World Wide Web’s architecture. It solves the problem of designing scalable, reliable, globally adoptable networked applications by codifying behavioural constraints.
How it works
REST defines six constraints—client-server separation, statelessness, cacheability, uniform interface, layered system, and optional code-on-demand—to govern how distributed, Internet-scale hypermedia systems behave.
What works
Its framework identifies real mismatches in deployed systems—like URI-embedded session state—and explains why those choices degrade caching and horizontal scaling.
What does not
The live Web does not obey every REST constraint. Session state embedded in URIs or HTTP cookies violates statelessness and harms caching and scalability.
What it changes
It changes how engineers reason about the Web—not as a collection of endpoints, but as a hypermedia-driven state machine where application flow emerges from links and representations.
Is it worth your time
Yes—if you design or maintain web APIs and need a rigorous lens to evaluate scalability, caching, and coupling. No—if you treat REST as a checklist for HTTP endpoints without engaging its hypermedia constraint.