The Voortrekkers (Afrikaans and Dutch for pioneers, literally "those who trek ahead", "fore-trekkers") were emigrants during the 1830s and 1840s who left the Cape Colony (British at the time, but founded by the Dutch) moving into the interior of what is now South Africa. The Great Trek consisted of a number of mass movements under a number of different leaders.

Extracted from Wikipedia, visit the website for more information.

Other websites:
Die Voortrekkers se Amptelike Afrikaanse Webtuiste (The Voortrekker's official Afrikaans Website).
Voortrekker History