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In Node.js, asynchrony is a key feature that allows the program to avoid blocking execution during I/O operations.

Main asynchronous operations and functions:

• Callbacks: functions passed as arguments and called after the operation completes.

const fs = require('fs');
fs.readFile('file.txt', 'utf8', (err, data) => {
  if (err) throw err;
  console.log(data);
});

• Promises: objects representing the result of an async operation, with .then() and .catch() methods.

fs.promises.readFile('file.txt', 'utf8')
  .then(data => console.log(data))
  .catch(err => console.error(err));

• async/await: syntactic sugar over promises, allowing writing async code in a synchronous style.

async function readFile() {
  try {
    const data = await fs.promises.readFile('file.txt', 'utf8');
    console.log(data);
  } catch (err) {
    console.error(err);
  }
}
readFile();

• EventEmitter: allows reacting to events, which is also a form of asynchronous programming.

Thus, in Node.js, asynchronous operations enable efficient working with files, network, and other resources without blocking the main execution thread.