Can someone please give me a brief description of Plessy v. Ferguson?

Plessy v. Ferguson was a landmark 1896 U.S. Supreme Court decision that upheld the constitutionality of racial segregation under the “separate but equal” doctrine. The case stemmed from an 1892 incident in which African American train passenger Homer Plessy refused to sit in a car for Black people. Rejecting Plessy’s argument that his constitutional rights were violated, the Supreme Court ruled that a law that “implies merely a legal distinction” between white people and Black people was not unconstitutional. As a result, restrictive Jim Crow legislation and separate public accommodations based on race became commonplace.

What are they! i have no idea lol

Electricity is the answer