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A fibrous joint is one where the bones are connected by dense connective tissue, allowing little to no movement between them. The key characteristic of fibrous joints is that they are very stable and primarily serve to connect bones in a way that reinforces their structural integrity.

The correct example of a fibrous joint is found in the skull bones, specifically the sutures. These are immovable joints where the bony edges fit together tightly, providing protection for the brain and forming the structure of the skull. They are crucial in protecting the cranial cavity and accommodating the growth of the skull in early development.

In contrast, the other options represent different types of joints. The knee, shoulder, and elbow joints are all classified as synovial joints, which are characterized by a fluid-filled joint capsule that allows for a greater range of motion. These joints are designed for movement and flexibility, which is not the primary function of fibrous joints like those found in the skull.