High pegging vs high hand

I use the app cribbage pro and at the end of the game it gives you the high pegging score and highest scoring hand total What is the difference ? For instance my high hand was 24, and the high pegging for the game was 15.. Thanks in advance !

Cribbage

There are two distinct parts of playing cribbage. "pegging' and counting your hand, or the "show" The program is showing you what the top scores were in each part of the game.