Node.js helps web applications grow and handle lots of users thanks to its special design. Instead of waiting for things like database queries to finish, Node.js can work on other tasks. This makes it faster and better under heavy use.

Key Features That Help Node.js Scale:

• Single-threaded Event Loop: This means it can take care of many connections at the same time.
• Asynchronous APIs: Functions, like fs.readFile, can run without stopping everything else.
• Clustering: By using several processes, Node.js can make the most of computers with multiple cores.

Example:

Imagine a chat app where many users are talking at once. Node.js can easily handle thousands of these connections, allowing everyone to chat quickly without any delays.