A vent hole is a small opening or a perforation made in an object, usually to allow air or gas to escape or to let in fresh air. It is also known as a vent, air hole, or exhaust port. Other synonyms for vent hole include breathing hole, draft hole, vent slot, air escape, aperture, hole, slit, gap, and outlet. All these words are commonly used to describe a hole in an object or a system that facilitates air circulation. Vent holes are prevalent in many machines, devices, and structures, and they serve different purposes, including ventilation, cooling, and pressure relief.