is a widely-used computer security
feature. It is generally used to allow certain individuals access to information
that are not fit for the public
at large (e.g. - bank account statements, databases
, some web sites, some operating system
Essentially, every user is issued either a password or a username/password set and this information must be entered into appropriate data entry fields before the user may access whatever it is they are accessing. Persons without a recognized username and/or password will not be allowed access.