Non-blocking I/O, also known as asynchronous I/O, is a method used in Node.js to handle tasks concurrently. With non-blocking I/O, tasks can be processed without waiting for the completion of previous tasks.
For example, when a data read/write operation is initiated, instead of waiting for the entire process to complete before moving onto another task, Node.js can run other tasks concurrently.
When the operation is completed, a callback function will be executed to handle the results. This is accomplished through the use of an event loop, which allows Node.js to perform non-blocking I/O operations in a single thread, ultimately improving its performance and efficiency.
