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There are several of these joints in the skull, examples include: Coronal Suture (between frontal and parietal bones); Lamboidal Suture (between the parietal and occipital bones); and Sagittal Suture (between the two parietal bones). These joints hold the bones of the skull together. Floor of the cranium, inferior to the frontal bone and anterior to the sphenoid. Non-technically: Centre of the face, behind the nose. Forms part of the nasal cavity and the orbits.
A craniovertebral joint is exactly what it sounds like: a joint that permits movement between the vertebral column and the skull. The ligaments in the spine support and reinforce the joints between the vertebrae. The atlas and axis in particular work with the ligaments to move the neck. The atlas and the occipital bone form the atlanto-occipital joint, which allows neck flexion. When you nod your head as if to say yes, that is neck flexion. The atlas and axis form the atlanto-axial joint, which allows head rotation.