Domain Expansion is a powerful technique in the anime and manga series Jujutsu Kaisen. It allows sorcerers to create a unique space that enhances their abilities and guarantees a hit on their opponent. This technique is often used in battles to gain a significant advantage. In a Domain Expansion, the user can manipulate the environment and rules within their domain, making it difficult for opponents to escape or counterattack. Each Domain has its own characteristics, reflecting the user's skills and personality, which can lead to various strategic outcomes in combat.