How does propulsion work?

What kind of fuel do DS1's attitude thrusters use, and how much of it do they use?

The attitude thrusters are small hydrazine thrusters. Hydrazine is a monopropellant and not much will be used per course correction, but as DS1 plans to correct course once per week, there will be ample use of it in small amounts. There are only 28 kg of hydrazine going into space on DS1, so the designers expect less than that to be used in the life of the mission.

What is a propellant?
Why does DS1 have two types of propulsion?
How long do space missions take?

What is attitude control?
What would happen if DS1 ran out of fuel?
What are the types of rocket propulsion?

What is hydrazine?
What is a monopropellant?