Which major conflict did Livy describe in Books 21 through 30?

In his extensive historical work, the Roman historian Livy dedicated Books 21 through 30 to describing the Second Punic War.1

This conflict, which lasted from 218 to 201 BCE, was a monumental struggle between Rome and Carthage. Livy’s account covers the war's progression, including the campaigns of the Carthaginian general Hannibal and the eventual Roman victory, which culminated in the Battle of Zama.23