What exactly is the point of having the LDAP standard if it can be implemented easily on top of an existing database system?

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A: A computer along with additional hardware and software together is called a computer system.

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Transaction Processing

Transaction processing is a computational style generally performed by server computers, which supports interactive applications (apps). Transaction processing is also known as information processing, which divides the work into indivisible and individual operations called transactions. The transaction is a set of tasks; a single task is considered as the minimum processing unit that cannot be divided again.