Many of these creatures started off as a stat block in one of the many monster sourcebooks that have been released by Wizards of the Coast, in order to widen the player’s and DM’s ability to shape their worlds, they have been made into playable races. These creatures vary wildly from your plain old humans to axe swinging Orcs to experimental creatures that have been fused together by magic. There are many different types of creatures that call the wondrous, fantastical lands of D&D home.
DnD 5e Races Ability Modifier Breakdown.