Request/response caching in ASP.NET Core allows you to cache the entire response of a specific request and serve subsequent requests with the cached response. This can significantly improve the performance of frequently accessed endpoints. You can enable request/response caching by adding the ResponseCaching middleware to the pipeline and configuring cache-related options. Caching can be applied based on various criteria such as the request URL, query parameters, or headers. The cached responses are stored in memory or persisted in a distributed cache like Redis. The middleware intercepts incoming requests, checks if a cached response exists for the request, and if found, serves the cached response instead of executing the request pipeline. You can set cache expiration policies, cache validation strategies, and cache-control headers to control the caching behavior. Request/response caching is particularly useful for static or less frequently changing content that can be safely cached and served to multiple clients.