As an asynchronous, non-blocking input/output (NIO) framework, Netty is used for the rapid development of maintaining highly scalable protocol servers and clients. Building low-level network servers and clients is relatively straightforward with Netty. Developers can work on the socket level (e.g. creating original communication protocols between clients and servers).
Blocking and non-blocking unified APIs, amenable threading model, and SSL/TLS are all supported by Netty. All requests run asynchronously on an individual thread with a non-blocking server. (The event loop shouldn’t be blocked by the function.) This contradicts operations performed in a blocking server model, which usually uses a separate thread to run each request. Without the need for switching or creating threads when the load increases, the non-blocking model decreases overhead and allows for faster development as traffic expands.