What is the significance of scalability in Node.js application development and why is it important?

Scalability in Node.js refers to the ability of an application to efficiently handle increasing volumes of requests or data without performance degradation. This is important because Node.js operates on a single-threaded event loop, and as the load grows, it is necessary to distribute tasks to avoid bottlenecks.

Why scalability is important:

• It allows serving more users without significant hardware costs.
• It ensures stability and responsiveness of the application during peak loads.
• It simplifies the development and maintenance of the application as functionality grows.

For scaling in Node.js, clustering (using the cluster module), running multiple processes, load balancing, and microservice architecture are often used.