Linux implements to determine how a user is to be authenticated and whether there are password policies associated with password databases.

Pluggable authentication modules (PAM).

Explanation:

These are schemes that are seen to be used in API authentication. It is relyed on to provide high authentification protocool in any correct form it is seen to be in use. also its ability to grant access to each other within two people interface are reasons big user clients refer to it in most of their policies that deals with their working system passwords and their database passwords to most of their files. This is why the company in the context which is a big firm rely on it for its services.

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