In England, Wales and Northern Ireland, a town traditionally was a settlement which had a charter to hold a market or fair and therefore became a "market town". In Scotland, the equivalent is known as a burgh (pronounced [ˈbʌɾə]). There are two types of burgh: royal burghs and burghs of barony. In more modern times it is often considered that a town becomes a city (or a village becomes a town) as soon as it reaches a certain population, although this is an informal definition and no particular numbers are agreed upon.