Half Guard is a position in Brazilian Jiu-Jitsu and mixed martial arts where one fighter is on their back with one of their opponent's legs trapped between their own. This position allows the bottom fighter to defend against attacks while also creating opportunities for sweeps and submissions. In Half Guard, the bottom fighter can use their free leg to create leverage and control their opponent's posture. It is a versatile position that can lead to transitions into more dominant positions or submissions, making it a valuable skill for practitioners to master.