# Introduction
[dyer] is designed for reliable, flexible and fast Request-Response based service, including data processing, web-crawling and so on, providing some friendly, flexible, comprehensive features without compromising speed.
`dyer` provides some high-level features:
- asynchronous, lock-free, concurrent streaming and I/O, make the best of thread pool, network, and system resource.
- Event-driven, once you set the initials and recursive conditions, `dyer` will handle
the rest of it.
- User-friendly and flexible, `dyer` offers high-level, easy to use wrappers and APIs what does a lot for you.
[dyer]: https://github.com/homelyguy/dyer