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The Goliath is the Terran's best "anti-air" ground unit, due to its high range, damage, and health relative to the Terran's alternatives, the Marine and Ghost. The Goliath's air attack is actually two simultaneous attacks, meaning a unit's armor should be counted twice. In addition, it is an explosive attack type, so it does 50% damage to small units, 75% damage to medium units, and 100% damage to large units. It can receive the Charon Boosters upgrade to increase its anti-air attack range by three. Dispatching some goliaths with your Terran push can be wise and effective at preventing drops on your Siege Tank push.
Researched at the Machine Shop.
 Competitive Usage
 versus Zerg
Goliaths are generally used in conjunction with Siege Tanks, and sometimes Vultures or Valkyries in mech or mech-bio TvZ variants. The Goliath's purpose is to help stifle the Mutalisks. While Goliaths are relatively immobile compared to the Marine and Medic combination, its superior range and damage compensates. Goliaths high rate of fire and high health make them fare very well against Zerglings. Also, they have longer range than Mutalisks. Hold position micro is useful against enemy Mutalisks while running away to use the Goliaths' superior range.
Goliath, Vulture, Siege Tank "balls" that are fully upgraded are notoriously hard to stop.
With the advent of the Fantasy Build, Goliaths are becoming more and more common on the TvZ battlefield.
 versus Terran
Goliaths are used to help stop early Wraith attacks and are very good against Vultures with Spider Mines. Commonly, drops have a Goliath or two in them in order to shoot down Wraiths or even approaching Dropships.
Some Terrans may also choose to harass the opposing player's economy with Goliaths. Because four Goliaths fit inside a Dropship, Goliaths are fairly efficient at killing SCVs.
 versus Protoss
Being the premier Terran anti-air unit, Goliaths are seen at least in some numbers in virtually all TvPs where the Protoss decides to use air units. Goliaths are sometimes seen in small numbers during the mid-game to pick off Shuttles and Observers. When facing Arbiters on the field a handful of Goliaths are useful to snipe them or force them back. Against Carriers, Terrans will generally pump mass Goliaths as their long range and high damage are the best deterrent to Protoss air.
 See also