Like a DVD and stuff like that.
It is a misspelling.
If you misspell a word the red wavy line will appear and give a suggestion when right clicked.
Answer:
I believe it is just a task. Since there exists(on windows) the Task Manager application, where you can stop any running <em>task, </em>I think that they are called tasks
Explanation:
People earn income by getting jobs and working. When they work, they get paid. That's an income
