Years ago, in South Africa, you were classified according to the colour of your skin and the coarseness of your hair. You were told where you could and couldn’t live. You were told which bus you could and couldn’t ride. You we told who you could and couldn’t marry. Racism is part of our history. South Africa, the USA and many other countries have struggled and continue to struggle with racism.
A good definition of racism is: an explicit or implicit belief or practice that distinguishes or values one race over other races.
A racist believes that their race, whatever it may be, is superior to other races.