Can you explain what is meant by 'cluster' in the context of information technology?.

In information technology, a "cluster" is a group of interconnected computers or servers that work together as a single system to improve performance, fault tolerance, and scalability.

Main characteristics of a cluster:

• Distributed processing: tasks are distributed among the cluster nodes.
• Fault tolerance: if one node fails, others continue to operate.
• Scalability: new nodes can be added to increase capacity.

For example, in Node.js, the cluster module allows running multiple processes (workers) that share a single server port, which helps efficiently utilize multi-core processors and improve application performance.