Describe a three state process model as used in operating system?

A three state process model in operating systems typically consists of three main states that a process can be in at any given time:

1. Running state: In this state, the process is actively being executed by the CPU. It is utilizing system resources and performing its designated tasks.

2. Ready state: In this state, the process is ready to be executed by the CPU but is currently waiting for its turn. It is waiting in the ready queue for the CPU scheduler to allocate CPU time to it.

3. Blocked state: In this state, the process is unable to proceed due to some external event or condition. This could be waiting for user input, waiting for a resource to become available, or waiting for another process to complete. The process is moved to the blocked queue until the event or condition is resolved.

These three states form the basis of process management in operating systems, allowing the system to efficiently allocate CPU time and manage the execution of multiple processes concurrently. The transitions between these states are managed by the operating system's scheduler and are crucial for maintaining system stability and performance.