Every online slot such as the one on https://www.za-onlinecasino.biz is actually a complex computer program. Broadly, there are two kinds of slots- Classic and Video. Classic slots are those that don't have specific themes or story lines. These games are known for for their fruit and candy based symbols and some of these slots can make you immensely rich. Video slots like Starburst and Gonzo's Quest have specific themes and are known for excellent animation, graphics, etc.