What is the Authentication ?

The process of identifying an individual, usually based on a username and password.

In a communication system, authentication verifies that messages really come from their stated source, like the signature on a (paper) letter.

In security systems, authentication is distinct from authorization , which is the process of giving individuals access to system objects based on their identity. Authentication merely ensures that the individual is who he or she claims to be, but says nothing about the access rights of the individual.

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