The Diablo 2 Wiki
The Diablo 2 Wiki archive is available for anyone looking for information on Diablo 2. All information here is pre-D2R but contains a lot of useful information that is still relevant. Updated sections for new D2R features can be found on the PureDiablo Diablo 2 section


From Diablo 2 Wiki

Fire damage is one of the four kinds of elemental damage. Its value comes in relative high amounts of damage, and of course that it enables you to have more than one damage type, which is of huge value later in the game (damage immune monsters)