For questions about the vinyl medium, including LPs, EPs and 45's (aka singles)

The term "Vinyl" is typically used to describe records, LPs, EPs, 45's, 78's, and other terms used for phonograph discs. Vinyl is actually a chemical compound (polyvinyl chloride) which was first used in the production of records in the late 1800's.

For further information, please see the Wiki article for Gramophone Record.