Plagiarism:

Q1) what is plagiarism? 

A1) when you are taking other people work and making it your own.

Q2) What do you do if you want to include another person's work to support an argument or to illustrate an idea?

A2) you inform them if you are going to use there work and acknowledge them when you use it. 

Q3) What might happen if you are caught plagiarising some else's work?

A3) you can get sued by the person that has made the work.