What is what does pound for pound mean?

Pound for pound is a term used in combat sports to compare the relative strength and abilities of fighters of different weight classes. It is a theoretical measure of a fighter's skill and ability to fight in relation to their weight, independent of their actual size. Essentially, it means if two fighters of different weight classes were to fight, the pound for pound comparison would determine who is the better fighter overall, regardless of their size. It is often used to compare the abilities of fighters in different weight classes, and to determine who is the best fighter in the world.