A street is a public thoroughfare (usually paved) in a built environment. It is a public parcel of land adjoining buildings in an urban context, on which people may freely assemble, interact, and move about. A street can be as simple as a level patch of dirt, but is more often paved with a hard, durable surface such as concrete, cobblestone or brick. Portions may also be smoothed with asphalt, embedded with rails, or otherwise prepared to accommodate non-pedestrian traffic.
Originally the word "street" simply meant a paved road (Latin: "via strata"). The word "street" is still sometimes used colloquially as a synonym for "road", for example in connection with the ancient Watling Street, but city residents and urban planners draw a crucial modern distinction: a road's main function is transportation, while streets facilitate public interaction. Examples of streets include pedestrian streets, alleys, and city-centre streets too crowded for road vehicles to pass. Conversely, highways and motorways are types of roads, but few would refer to them as streets.
The word street has its origins in the Latin strata (meaning "paved road" - abbreviation from via strata); it is thus related to stratum and stratification. Ancient Greek means army; Greeks originally built roads to move their armies. Old English applied the word to Roman roads in Britain such as Ermine Street, Watling Street, etc. Later it acquired a dialectical meaning of "straggling village", which were often laid out on the verges of Roman roads and these settlements often became named Stretton. In the Middle Ages, a road was a way people travelled, with street applied specifically to paved ways.