Each race have different types of units. The Protoss have powerful warriors and machinery that cost lots of minerals and gas to build. The Zerg use many fast and low cost units to defeat their enemies. Terran units mix between Protoss and Zerg units. They have strong, but easy to kill units that are powerful when used in formation. No race in "StarCraft" is more powerful than another race. Blizzard has released many small updates to the game that keep all the races balanced.