Explain the Mandela effect?

The Mandela effect is the observed phenomenon of people having clear memories of events that did not occur or misremembering significants events and facts. the term was coined in reference to events that large numbers of people around the world share false memories of but is often generalized to refer to any incident of a false memory

The Mandela Effect is sorta complicated but simple at the same time.

It's basically things that humans remember as one thing but when they go back to it it's different. For example Febreeze is remembered as being spelled like that but is actually spelled Febreze. Many youtubers have made videos on popular ones.