Intractability (complexity)

Intractability (complexity) is a measure of how hard it is to solve a problem. The harder it is to solve a problem, the more complex it is. For example, if a math problem has a lot of equations and you need to solve them all, then it's very complex and it's much harder to find the answer than if the math problem only had a few equations. In general, if a problem is too complex for a computer to solve, it's called intractable, or impossible to solve.