Rate limiting is a technique that controls how many requests a client can make to a service within a set period of time. It protects systems from overload, abuse and runaway costs.
Caching stores copies of frequently used data in a faster location so future requests can be served without repeating slow work. That slow work might be a database query, a computation or a network call.
An API gateway is a service that sits in front of a set of APIs as a single entry point. It routes requests and handles shared concerns such as authentication, rate limiting, logging and transformation.
API security is the practice of protecting application programming interfaces from misuse. It controls who can call them, what data they can reach and how much they can request.
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