Editing Experience point (section)

===Perks===
{{see also|Skill tree|Power-up}}
{{more citations needed section|date=November 2019}}

"Perks" are special bonuses that [[video game]] players can add to their characters to gain special abilities. The term refers to the general usage of "[[wikt:perk|perk]]" as an abbreviation of "[[wikt:perquisite|perquisite]]". Perks are permanent rather than temporary and are progressively unlocked through experience points. The first video game to use the term "perks" to refer to such a mechanic was the 1997 role-playing video game ''[[Fallout (video game)|Fallout]]''.

Besides RPGs, perks have been used in various other video games in recent times, including [[first-person shooter]]s such as ''[[Call of Duty 4: Modern Warfare]]'' (2007),<ref name="Shamoon">{{cite web|last1=Shamoon|first1=Evan|title=Call of Duty 4 Preview for 360 from 1UP.com|url=http://www.1up.com/previews/call-duty-4_7|website=[[1UP.com]]|publisher=Wayback Machine|access-date=9 November 2017|archive-url=https://web.archive.org/web/20160623225728/http://www.1up.com/previews/call-duty-4_7|archive-date=23 June 2016|date=10 August 2007}}</ref> ''[[Call of Duty: Modern Warfare 2]]'' (2009), and ''[[Killing Floor (2009 video game)|Killing Floor]]'' (2009), as well as [[action game]]s such as ''[[Metal Gear Online]]'' (2008).