Cover

Cover or covers may refer to:

Packaging, science and technology

A covering, usually one that completely closes the object
- lid (container)
- housing (engineering), an exterior case or enclosure used to protect an interior mechanism
- seal (mechanical), a device that helps join systems or mechanisms together by preventing leakage
- Smartphone cover, hardware to protect a mobile phone
The outside of an object, not necessarily enclosing the object
- Cover (philately), generic term for envelope or package
Protection
- Cover system, a system of protection in video games
- Cover (military), a form of protection in combat
Engineering
- Concrete cover, distance between reinforcement and the outer surface of element
Geology
- Sedimentary cover, in geology, overlies a basement or crystalline basement
Album cover, the front of the packaging of a commercially released audio recording product
Book cover or magazine cover
CD and DVD packaging
Cover art, images and text on media covers

Cover (surname)
- Franklin Cover (1928–2006), American actor
- Robert Cover (1943–1986), American law professor, scholar, and activist
- Thomas M. Cover (1938–2012), American scientist

Cover version, a new version of a previously recorded song
- Cover band, a musical band that performs mostly cover versions
Cover, an understudy in opera

Official cover, operative who assumes a position in an organization with diplomatic ties
Non-official cover, operatives who assume covert roles in organizations without official ties to the government
Something fake used in a cover-up
Cover (telecommunications), a communications concealment technique

Cover (topology), the mathematical concept of a collection of sets whose union contains each set as a subset
Good cover (algebraic topology), an open topological cover such that all open sets in the cover and all intersections of finitely many open sets are contractible
Cover (algebra), the concept of an algebraic structure that maps onto another structure in structure-preserving fashion
A pair in the covering relation of a partially ordered set, or the greater element in such a pair
A covering space, in the theory of Riemann surfaces and topology
A (universal / double), covering group, a covering space with group structure, common in theoretical physics
Cover, an equivalent set of constraints in database theory

Cover (cricket), a region of the field with respect to the batsman in cricket
Cover 2, a class of defensive play in American football
To cover, in sports betting a favorite to win by more than the game's point spread

Cover charge, an entry fee
Cover (law), a remedy for the breach of a contract for the receipt of goods
Cover (finance), repurchasing a short order made on the stock/equity, forex or futures markets
First day cover ("FDC" also called a first day of issue), a postage stamp on a cover, postal card or stamped envelope franked on the first day of issue

Mating of animals, e.g. a stallion covers a mare
The seating capacity for one person in a restaurant
The top layer of bedding
Slipcover, protective cover that may be slipped off and on a piece of upholstered furniture
Cover, a military term for any type of uniform hat, as in utility cover and campaign cover