There are four major components to any full-size rocket. These include the structural system, the payload system, the guidance system, and the propulsion system. The structural design has all the parts that make up the rocket's frame, the cylindrical body, or any control fins.
The structural system's function is to transfer the loads from the forces engendered during flight and provide how aerodynamic drag for flight through the atmosphere. The frame is made from extraordinarily strong but lightweight materials, like titanium or aluminum. It typically employs long stringers that run from the top to the bottom and are attached to the "hoops" that run around the circumference.
The guidance system may include complex sensors onboard computers, radars, and communication equipment to handle the rockets in flight. The guidance system must also offer some level of stability to avoid any mishaps during flight.