Surrealism is a style of art and writing from the early 20th century — it started in the 1920s, mostly in France — where the artist puts things together that do not belong together, so the picture feels like a dream. A clock melting over a tree branch. A man in a suit with an apple in front of his face. The idea behind it was serious: those artists believed the strange part of your mind, the part that makes dreams, was more honest than the tidy part that makes sense, so they tried to let it out on purpose. When people say "Surrealism" with a big S, they usually mean that art movement — Dalí, Magritte, the poet André Breton who wrote the rules for it. But most people today use "surreal" (the adjective) much more loosely, for anything real that feels impossibly strange: "It was surreal seeing my teacher at the night market in shorts." Nothing dreamlike happened; it just did not fit. That loose use is very common and completely fine in everyday talk. The full word "surrealism" stays more formal — you meet it in museums, art class, and film reviews. Note also that "surreal" and "unreal" are not the same: unreal means not real, surreal means real but wrong-feeling.