What is the difference between apartheid and slavery?

The world still has slavery in terms of forced sex work and forced labour, but those aren't based on ethnicity. In terms of slavery as a form of ethnic-based discrimination, there are differences between slavery and apartheid. Apartheid means segregation - being separate; Slavery is involuntary servitude. During the times when slavery was legal in the UK and the USA, slaves were not paid for their work and no thought was given to their education. During apartheid, servants (not slaves) were paid for work and had very good education and medical facilities compared to other African countries at that time. The education and medical facilities were race-based, so blacks had their own and whites had theirs. Another difference is that during slavery in the US and UK, slaves were their masters' property. In South Africa, servants were often looked down upon and seen as lesser-humans, but were never anyone's property to be bought and sold.