The Inner Sphere is a term used in the fictional universe of the BattleTech franchise, referring to a region of space that includes several key human-inhabited star systems. It is characterized by a mix of advanced technology and feudal political structures, where various factions, such as the House Davion and House Kurita, vie for power and control. This region is contrasted with the Outer Sphere, which consists of less developed areas and fewer resources. The Inner Sphere is central to the ongoing conflicts and stories within the BattleTech universe, showcasing the struggles between different houses and their military forces, including giant combat machines known as Mechs.