What does the 'Jim Crow Laws' refer to?

The Jim Crow laws were a set of laws introduced in the Southern States of America, after the American Civil War had banned slavery. The Jim Crow Laws were designed to enforce 'segregation', which was a practice of keeping black and white Americans separate. This meant that separate facilities, such as toilets, schools, transport, cinemas, shops - everything! - were provided, and the facilities for black Americans were always much poorer in quality. So, in short, the Jim Crow laws were a racist set of laws designed to keep black Americans oppressed once slavery was banned.