An atomic process means a process which is not divisible or should not divide.
Suppose, you have a process contains more than one operation and more than one thread accessing the same process. Now if one thread executes the first operation and then stored some data to complete the rest of the process. In the meantime, another thread comes in and also did the first operation and changed the stored data. This case, the first thread might have inconsistent data for the rest of the operations.
In such a situation the process should complete as a whole and is called an atomic process. This case we might use synchronization so that other thread cannot comes in while one thread is executing the process.
Hope, this helps.
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