How do conventional rockets work?

What is hydrazine?

Hydrazine is a family of compounds that are used in the rocket industry as monopropellants.

Compound Chemical Formula
Hydrazine N2H2
Monomethyl hydrazine(MMH) CH3NHNH2
Unsymmetrical dimethyl hydrazine (UDMH) CH3NNH2

It is used as a monopropellant because hydrazine will decompose (ignite) when placed in contact with platinum group metal catatlysts. Hydrazine is popular with satellite builders because the monopropellant properties save space, complexity, and weight. It saves space because there is no need to carry up a separate oxidizer. It saves weight and simplifies the system because there is only one set of plumbing and no ignition system.

What is a propellant?
How does propulsion work?

What kind of fuel do DS1's attitude thrusters use, and how much of it do they use?
What are the types of rocket propulsion?
What is an oxidizer?

What are some rocket propellants?
What is a monopropellant?