Gojo's Domain Expansion is a powerful technique used by Satoru Gojo, a character from the manga series "Jujutsu Kaisen." It allows him to create an area of space where he has complete control and supremacy. Within this domain, Gojo is able to manipulate the flow of time and space, control the landscape, and attack his opponents with devastating force. The Domain Expansion also acts as a barrier, preventing anyone from leaving or entering the designated area without Gojo's permission. This technique is considered one of the most powerful and versatile in the series.