In Call of Duty: Blackops 4 Multiplayer matches there is a collection of Perks which you can equip to up your game. These Perks grant you a variety of abilities, from being able to hold your breath for longer to tagging enemies through walls. In total there are 13 different Perks to choose from and each has their own unique effects and stat boosts. Perks are assigned in the Loadout menu, and you can have three selected at any one time. Perks can only be assigned to a specific slot and cannot be stacked.
Engineer
Detect enemy equipment and Scorestreaks through walls. Re-roll and booby trap Care Packages
Flak Jacket
Take less fire damage, explosive damage, and radiation damage.
Tactical Mask
Resistant to 9-Bang, Concussion, Razor Wire, Reactor Core, Seeker, Tempest fire, and Counter UAV
Scavenger
Replenish ammo from fallen players.
Cold Blooded
Increased resistance to enemy Ability, Equipment, and Scorestreak targeting systems. Enemy AI will be delayed when targeting you. Player-controlled Scorestreaks will not highlight you with a targeting reticle
Dexterity
Mantle, climb, slide, and swap weapons faster. Increased weapon accuracy while jumping or mantling.
Gung-Ho
Fire your weapon and use equipment while sprinting. Also recover from sprint faster and move at full speed while reloading.
Lightweight
Move faster while sprinting and take no damage from falling.
Skulker
Move faster while crouched and prone
Tracker
See digital imprint of enemy footsteps and receive an alert on your HUD when revealed in enemy Fog of War.
Dead Silence
Move quietly and resist detection from an acoustic sensor.
Team Link
See friendly teammates through walls and increase your personal and teammates Fog of War reveal radius.
Ghost
Undetectable by enemy UAVs while moving, planting, or defusing bombs, or controlling streaks. Reduced reveal on enemy Sensor Darts and Vision Pulse.
Equipment Charge
Equipment and Specialist weapon recharge faster.
Acoustic Sensor
Enemy movements are easier to hear and trigger minimap indications.
COMSEC Device
Scorestreaks are earned at a discounted cost.
Stim Shot
Heal instantly and more often while mantling control of your weapon.
Body Armour
Increased protection from initial bullet damage.
Wild Cards allow you to customise your class to fit your playstyle. This includes being able to to have more perks equpied at once.
Overkill
Replace secondary with any primary not in use
Primary Gunfighter 1/2/3
Unlocks 1 additional attachment slot for your primary weapon
Primary Operator Mod
Unlocks the Operator Mod slot for your primary weapon
Underkill
Replaces primary with any secondary not in use
Secondary Gunfighter 1/2/3
Unlocks 1 additional attachment slot for your secondary weapon
Secondary Operator Mod
Unlocks the Operator Mod slot for your secondary weapon
Gluttony 1/2/3
Use all three perk slots to select perks from Perk 1/2/3
Greed 1/2/3
Take a second Perk 1/2/3