What type of joints hold bones together but do not allow movement?

The type of joints that hold bones together without allowing movement are fibrous joints. These joints are connected by dense connective tissue, which provides stability and support but restricts movement. The structure of fibrous joints can vary; for example, sutures in the skull are rigid and completely immovable, while syndesmoses, such as the connection between the tibia and fibula, allow for slight movement but are primarily fixed.

Cartilaginous joints, while also providing connection between bones, do allow for some movement. Synovial joints are characterized by their ability to facilitate a wide range of movements due to the presence of a joint cavity and synovial fluid. Diarthrodial joints are another term for synovial joints, emphasizing their mobility. Therefore, fibrous joints are the category that specifically prevents movement, aligning perfectly with the criteria stated in the question.