# userver: Core Functionality

This folder contains the userver core functionality:

* The Asynchronous engine itself
* [Synchronization Primitives](https://userver.tech/d6/d6c/md_en_2userver_2synchronization.html)
* [Unit Tests and Benchmarks](https://userver.tech/d4/d70/md_en_2userver_2testing.html)
* HTTP Client and Server
* [Component System](https://userver.tech/dc/dcc/md_en_2userver_2component__system.html)
* Sockets
* [Dynamic Configs](https://userver.tech/d5/d46/md_en_2userver_2dynamic__config.html)
* [Caches](https://userver.tech/d5/d2d/md_en_2userver_2caches.html)
* [Logging and Tracing](https://userver.tech/df/d0c/md_en_2userver_2logging.html)
* [Metrics](https://userver.tech/d9/dac/md_en_2userver_2service__monitor.html)
* All the helper classes and utilities provided by the `userver-universal`
