NP-hardness

NP-hardness is a classification used in computational complexity theory to describe certain types of problems. Specifically, a problem is said to be NP-hard if: 1. **It is at least as hard as the hardest problems in NP (nondeterministic polynomial time)**: This means that any problem in NP can be reduced to it in polynomial time. In more technical terms, if you can solve an NP-hard problem efficiently (in polynomial time), you can also solve any NP problem efficiently.