What is Apartheid? Why was it termed oppressive?

Follow this link to know the practice of Apartheid:

https://www.meritnation.com/ask-answer/question/how-can-you-say-that-the-apartheid-system-was-particularly-o/constitutional-design/1146599

It was abolished in South Africa officially in 1990 with repeal of the last of the remaining Apartheid laws, the end of Apartheid is widely regarded as arising from the 1994 democratic general elections being held.