sloop

thumb|A Bermuda sloop, the most common version of the sloop in modern sailing vessels thumb|Gaff rigged sloop, 1899

In modern usage, a sloop is a sailboat with a single mast generally having only one headsail in front of the mast and one mainsail abaft (behind) the mast. It is a type of fore-and-aft rig. The mainsail may be of any type, most often Bermuda rig, but also others, such as gaff or gunter.