A tent flap is a piece of fabric or material that covers the entrance or exit point of a tent. Its main purpose is to provide ventilation and protect the interior of the tent from external elements such as dust, rain or wind. Synonyms for tent flap include tent door, tent entrance, tent opening, and tent portal. Other similar words may also include flaps, zippers, or curtains. These synonyms all refer to the same concept of an entryway in a portable shelter that allows users to enter and exit while keeping the interior protected from the elements.