Original Artwork is the most pricey form of Art you can buy, but this is for good reason.
These are the pieces that have been produced by the artists themselves, not digital reproduction but an actual painting or sculpture. If you own an original... then no-one else has that piece.
Whilst it does costs more (often being 5-10 times or more) than art prints, it is also likely to appreciate more in value as the artist's work becomes more sought after.
Original Artwork will normally come framed by the artist and is the piece of work exactly as they intended it.