In Jujutsu Kaisen, all living beings emanate an energy called Cursed Energy,[Jp. 1] which arises from negative emotions that naturally flow throughout the body. Normal people cannot control this flow in their bodies.
As a result, they continually lose Cursed Energy, resulting in the birth of Curses,[Jp. 2] a race of spiritual beings whose primary desire is to bring harm to humanity. These curses are shown as gruesome monsters.
Jujutsu Sorcerers[Jp. 3] are people who control the flow of Cursed Energy in their bodies, allowing them to use it as they please and also to reduce its release.
High-ranking Sorcerers and Curses can refine this energy and use it to perform Cursed Techniques,[Jp. 4] which tend to be unique to the user or their family.
An advanced form of Cursed Technique is Domain Expansion,[Jp. 5] through which the user can use their Cursed Energy to build a pocket dimension that covers the surrounding area within which all attacks will be stronger.