In common language, a task is part of a set of actions which accomplish a job, problem or assignment.
Multi-tasking is when one performs a variety of tasks, ranging from at least two tasks, simultaneously. This is a great tool for people who have a lot to get done. However, it has been shown to make some people less effective, as they cannot focus as well when contemplating the resources required to accomplish the various tasks set out before them. However, some people are indeed quite adept at accomplishing multiple tasks at the same time, as they are capable of contributing brain power to each of the things they know they must do. These people are known as Adept Multi-Taskers.
In particular, task may refer to: