This article will explain the Starcraft 2 units and counters so that you can familiarize yourself with it and then successfully counter any enemy unit that even considers attacking.

 

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Zealot – Hellions, Colossi, Banelings, or Roaches

Stalker – Immortals, Marauders, Zerglings

Sentry – Hellions, Stalkers, Reapers, and Hydralisks.

Observer – Any stealth revealing unit or building.

Immortal – Any fast firing units

Warp Prism – Air attackers

Phoenix – Battlecruiser, Carrier, Corruptor

Void Ray – Viking, Phoenix, Corruptor

High Templar – Ghost, Zealot, Roach

Dark Templar – Biggest weakness getting revealed from cloak

Colossus – Ultralisk, Thor and Immortals

Archon Carrier – Thor, Ultralisk, Ghost (it should be noted that Arhcon is the only unit that receives normal damage from all other units)

Interceptor – Viking, Void Ray, Corruptor

Mothership – It’s slow which makes it more  prone to EMP’s and feedback, and is also not so strong versus other massive units.

Hydralisk  -  Large Armored units, MMM, AOE spells, Brood Lords, Colossus’s, Ultralisks, Thor’s, Templars, Banelings

Queen   – Off Creep, large groups of units, Roaches, Marauders, Marines, Hydralisks, Zealots

Zergling  – Large armored units, balls of ranged units, blockades/chokes, Roaches, Marauders/Marines, Hydralisks, Zealots

Read some great Starcraft 2 Tactics.

Overlord – Anti-Air (especially when speed isn’t upgraded)

Infested  - Overall Weak Support Unit, Roaches, Stalkers, Marauders, Marines

Roach – Marauders, Stalkers, Air, Well Defended Positions (short range), Colossus, Templar, Banshees, MMM

Overseer – Fast moving anti-air

Baneling  – High HP armored units, Air, Ranged Balls, Roaches, Marauders, Stalkers, Large Units

Infestor – If left alone, micro, Air, Air to Ground, Tanks, High Templar

Brood Lord – Fast Anti-Air units, some spellcasting, Any Air to Air Unit

Ultralisk – Anti-Armor Units, Air units, closed terrain, high damage units, Banshees, Thor’s, BattleCruisers, Void Rays, Carriers, Immortals, Brood Lords, Mutalisks, Infesters

Corruptor – Ground to Air, Large Air armies (non-massive), AE Spells, Mutalisks, Vikings, Hydralisks, Stalkers,

Mutalisk – strong AA units, turrets/cannons, AE spells, Hydralisks, Stalkers, Thor’s, Templar

Siege Tank – Open Ground, Fast Melee Units, Lack of Unit Support, Immortals, Banshees, BattleCruisers, Pheonix, Void Rays, Mutalisks, Brood Lords

Hellion – Armored Units, Air-to-Ground, Air to Ground, Tanks, Marauders, Stalkers, Immortals, Colossus, Roaches, Ultralisks

Ghost – Detectors, Large Armies, Thor, Marauders, Helions, Stalkers, Colossus, Roaches, Hydralisks, Ultralisks

Reaper – Large Armies, Fast Units, Ranged Units, Any non tier 1 melee unit

Marauder – Air-to-Ground units, anti-armored units, Choke Points, Stacked Armies, Tanks, BattleCruisers, Colossus, Carriers, Templar, Ultralisks, Hydralisk

Marine – Open Areas, Late Tier Units, Splash Damage, Tanks, Marauders, BattleCruisers, Zealots, Sentries, Colossus, High Templar Carriers, Roaches, Ultralisks, Infesters

Banshee – Air to Air, Large AA units/groups, Magic Casters, Air to Air Units, Thors, Hydralisk

Raven – If Left Alone, Long range AA, Air to Air Units

Medivac – If left alone, Fast or Long Range AA, Any support unit

Viking – Ground-to-Air, Weak in Ground to Ground Combat, Thors, Marines, Stalkers, High Templar, Hydralisks, Mutalisks

Thor – Fast Melee Units, Lack of Unit Support, Poor Terrain, Movement Speed, Battlecruisers, Tanks, Void Rays, High Templar, Infesters, Corruptors

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Battlecruiser – Long Range AA, Magic Casters, Viking (out ranged), Void Rays, High Templars, Corruptors

I’ve highlighted the most important Starcraft 2 Units and Counters so that you know which ones are important.