A fiber optic terminal box and a fiber optic splice closure are both used in telecommunications to protect and organize fiber optic cables, but they serve different purposes. A fiber optic terminal box is typically installed at the end of a fiber optic cable run, where it allows for easy access to the individual fibers within the optical cable. It can be wall mount or rack mount, and its main function is to terminate the incoming fiber cable and provide a connection point for customer equipment. On the other hand, a fiber optic splice closure is designed to join two or more optical cable together, whether they are of the same or different types. It is typically used in outdoor environments where optical cables may be exposed to moisture, extreme temperatures, or other environmental factors that could affect their performance. A fiber optic splice closure provides protection against these elements while maintaining the integrity of the splice.