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Semaphore is variable on which read and modified and update happens automatically on kernal mode.
Semaphore are two type:
1. Counting Semaphore
2. Binary Semaphore
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A Semaphore is a synchronization tool used to control access to shared resources among multiple processes or threads. It helps to prevent race conditions by allowing only one process to access the resource at a time and managing access through signaling mechanisms. Semaphores facilitate coordination and mutual exclusion, ensuring orderly resource usage in concurrent environments.