What does it mean for a problem to be considered NP-Hard?
When a problem is classified as NP-Hard, it means that it is at least as difficult as the hardest problems in the class of problems known as NP (Non-deterministic Polynomial time). NP problems are decision problems that can be solved in polynomial time by a non-deterministic Turing machine, a hypothetical machine that can explore multiple solutions simultaneously.

An NP-Hard problem, on the other hand, is a problem that is at least as hard as the hardest problems in NP. In other words, if an NP-Hard problem could be solved in polynomial time, then all problems in NP could also be solved in polynomial time.

The concept of NP-Hardness is important in computer science and mathematics because it helps to identify problems that are difficult to solve. Many optimization problems, such as the traveling salesman problem and the knapsack problem, are NP-Hard. While it is not currently known whether these problems can be solved efficiently, researchers have developed algorithms that can approximate solutions to within a certain degree of accuracy.