Origin

The character 紹 combines thread or silk (糸) on the left with 召 on the right, which serves as a sound hint for pronunciation. The connection between threads and the meanings of introduce or inherit likely comes from the idea of thread as something that links or connects things together—just as a thread joins separate pieces of material, introducing someone joins people together, and inheriting passes something down through a line of continuity. The 召 component doesn't contribute to the meaning but tells you roughly how the character should sound.