Answer the following question given this paragraph: 

A catalyst is a substance that increases the speed of a reaction. Overall, a catalyst is not a reactant and is not used up, but it still affects how fast a reaction proceeds. However, a catalyst does not affect the extent or position of a reaction at equilibrium. It helps a reaction achieve equilibrium faster.


Q: What is the term for a substance that causes the speed of a reaction to increase?


A:
catalyst