Skeletal development refers to the process by which the skeleton forms and matures in an organism. It begins in the embryo, where cartilage models of bones are created. Over time, these cartilage structures are gradually replaced by hard bone through a process called ossification. This development is crucial for providing support, protection, and structure to the body. During childhood and adolescence, skeletal development continues as bones grow in length and density. Factors such as nutrition, physical activity, and hormones play significant roles in this process. By the end of puberty, most bones have reached their adult size and shape, marking the completion of skeletal development.