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list
In computer science, a list is defined as an instance of an abstract data type (ADT), formalizing the concept of an ordered collection of entities. For example, an ADT for untyped, mutable lists may be specified in terms of a constructor.
In practice, lists are usually implemented using arrays or linked listsof some sort; due to lists sharing certain properties with arrays and linked lists. Informally, the term list is sometimes used synonymously with linked list. A===sequence=== is another name, emphasizing the ordering and suggesting that it may not be a linked list.
login
To log in (also: to log on, sign in, or sign on) is to identify oneself to the system in order to obtain access. The concept derives from the the action of clocking in on arrival at a factory, where a worker would stamp a timesheet or card upon their arrival. Its usage in computing derives from IBM parlance.The primary use of a computer login procedure is to authenticate the identity of any computer user (or computer software on this or a different computer) attempting to access the computer's services. The login procedure can also provide an audit trail of the use of the system.
