Web pages with pictures are good here - just remember to add lots of your words to describe what you learned through your research.
1) Find a circuit with a potentiometer(s) in it and explain the application of potentiometer(s) in a circuit.
2) What is a rheostat and how does it compare to a potentiometer?
3) Describe the anatomy of a wire-wound potentiometers
4) What is a trimmer potentiometer (or trim pot) ?
5) What does the term potentiometer "taper" mean and what are some examples?