A tram (also known as tramcar; and in North America known as streetcar, trolley or trolley car) is a rail vehicle which runs on tracks along public urban streets (called street running), and also sometimes on a segregated right of way. The lines or networks operated by tramcars are called tramways. Tramways powered by electricity, the most common type historically, were once called electric street railways. However, trams were widely used in urban areas before the universal adoption of electrification; other methods of powering trams are listed below under "History".

A tram is a rail-based public transport system, or the type of vehicle used on such a system, which runs primarily on streets (also known as a tramcar, trolley or streetcar); also used in mining.