Definition - What does Agent mean?
An agent is a program that collects information or performs a task in the background at a particular schedule. The term agent is often thought of as a software abstraction that is capable of acting with a certain degree of autonomy to perform a particular task on behalf of its host.
Techopedia explains Agent
Agents can be distinguished from objects due to their autonomous, flexible behavior. Software agents offer many benefits to end users by performing complex repetitive tasks.