The Hedgehog signaling pathway is a critical regulator of cell growth and differentiation during embryonic development. It is named after the Hedgehog (Hh) family of ligands, which include Sonic Hedgehog (Shh), Indian Hedgehog (Ihh), and Desert Hedgehog (Dhh). This pathway is not only essential in embryogenesis but also plays a role in the maintenance of adult stem cells and tissue homeostasis.