What is the concept of atomicity in programming and how does it ensure that operations are executed as a single, indivisible unit?

Atomicity in programming refers to the idea that certain operations should be executed as a single, indivisible unit. This means that either all the operations within a transaction are completed successfully, or none of them are. Atomicity ensures that operations are either fully completed or not executed at all, helping to maintain data integrity and consistency in the program.