Transportation or penal transportation is the sending of convicted criminals or other persons regarded as undesirable to a penal colony. For example, France transported convicts to Devil's Island and New Caledonia and England transported convicts, political prisoners and prisoners of war from Scotland and Ireland to its colonies in the Americas (from the 1610s until the American Revolution in the 1770s) and Australia (1788–1868). The practice became available in Scotland consequent to the Union of 1707, but was used less than in England.
Most of this article deals with transportation from Great Britain.
Banishment or forced exile from a polity or society has been used as a punishment since at least Ancient Roman times. It removed the offender from society, possibly permanently, but was seen as a more merciful punishment than execution.
Under English Law, transportation was a sentence imposed for felony, and was typically imposed for offences for which capital punishment was deemed too severe: for example, forgery of a document was a capital crime until the 1820s, when the penalty was reduced to transportation. The sentence was imposed for life or for a set period of years. If imposed for a period of years, the offender was permitted to return home after serving out his time, but had to make his own way back. Many offenders thus stayed in the colony as free persons, and might obtain employment as jailers or other servants of the penal colony.
Transportation was not used by Scotland before the Union of 1707. Post-Union laws made by the United Kingdom Parliament extended the availability to Scotland, but it remained little used under Scots Law until the early 19th century.