COPV, or Composite Overwrapped Pressure Vessel, is a term used in astronautics and aerospace engineering to refer to a type of pressure container used in spacecraft. Synonyms for COPV include pressure vessel, containment vessel, and high-pressure vessel. Other terms that may be used to describe similar containment systems include carbon fiber composite tanks, which are commonly used to store gases at high pressures in other applications. COPVs are crucial components of spacecraft and are responsible for safely storing propellants and other pressurized materials needed for missions in space. The development of new materials and technologies is leading to the evolution of this technology, with advancements that may result in new terms and synonyms emerging in the future.