Can you explain what the libuv library is and what tasks it is used for?

libuv is a cross-platform C library that provides an asynchronous event loop and low-level abstractions for working with the filesystem, network, timers, and other I/O operations.

In Node.js, libuv is responsible for implementing non-blocking I/O, allowing multiple operations to run in parallel without blocking the main thread. This ensures high performance and scalability of applications.

Main tasks of libuv:

• Managing the event loop
• Asynchronous I/O (files, network)
• Working with threads and thread pools
• Timers and signal handling

Example: when you make an asynchronous database request or read a file in Node.js, libuv takes this task and executes it in the background, notifying your code of completion via a callback or promise.