What is the reason for the occurrence of deadlock in systems and why is it important to know about it?

A deadlock occurs when two or more processes (or threads) simultaneously hold resources and each waits for the resource held by the other. As a result, none of them can continue working because each is waiting for the other.

Reasons for occurrence:

• Uncoordinated acquisition of multiple resources in different orders.
• Lack of timeouts or cancellation mechanisms.

Why it is important to know about:

• To prevent hangs and "frozen" states of programs.
• To ensure system reliability and stability.
• For proper design of synchronization and resource management.

Example: Thread A acquires resource 1 and waits for resource 2, while thread B acquires resource 2 and waits for resource 1 — a deadlock occurs.