"Permutation"

A permutation is a way of arranging or ordering a set of items where the order matters. For example, if you have three different books, the permutation considers all the possible ways you can line them up. The total number of permutations depends on how many items there are and whether you can repeat them. Essentially, permutations explore all different sequences you can create from a given group, highlighting the importance of arrangement in organizing or selecting items.