It is a modified incorrectly pronounced form of the English word “authentication” - “authentication”.

Authentication means the process of verifying that the subject has access rights to the information content of a computer system or web resource by comparing the data provided to him (login, password) with those stored in the system.

In short, authentication is the passage of the authenticity of the subject (user).

Is part authorization. The next step is to provide the user with access or reject his request, depending on whether authentication was successful.