Neck muscles are voluntary skeletal muscles that attach the base of the skull to the torso, primarily responsible for supporting the head and enabling head movement, as well as functions like swallowing and speaking. They are broadly categorized by location, including anterior (front), posterior (back), and lateral (side) groups, with key muscles such as the Sternocleidomastoid, Trapezius, Scalenes, Suboccipitals, Deep Cervical Flexors, and Suprahyoid muscles serving vital roles in head and neck movement and stability.