Professional bike races take place either over single or multiple days and now take place in every continent of the world! Single day races very rarely award a winners jersey, although this is quite popular in national level or amateur events allowing event sponsors some extra valuable brand exposure.
Stage races that take place over a number of days always have a leaders jersey and often comprise of other additional classifications that also have jerseys awarded. In the case of top-level UCI races, only a certain number of leaders jerseys are allowed so races like the Tour Down Under get round this by presenting a jersey on the podium which the riders cannot thenwear the following day!
Thanks to Sir Bradley Wiggins, Lance Armstrong and Chris Froome - every sports fan with only a passing interest in cycling will know the leader of the Tour de Frances wears a yellow jersey. Whilst the grand tour jerseys are well known - the Maglia Rosa for the Giro D'Italia - it tends to be the smaller races that have the more fun/bold/exciting leaders jerseys. The Tour of the Basque Country (Vuelta Ciclista al País Vasco) leaders jerseys being some of my favourites.
However, this page is not all about leaders jerseys! Over time I will be grouping team jerseys that have taken part in races into groups - like when I visited the 1997 Tour de France.