Fallout: New Vegas/Perks

Level perks
At every second level, you will have an option to pick an available perk. These perks have a level requirement, and may require other features as well before you can use their benefit.

Companion Perks
While you have a companion following you, they will grant you a perk, usually a minor bonus. The companions also have a quest available that improves them, although only one of them is a perk that directly assists the player.