Surrealism was a cultural movement that was developed in Europe. It was considered the "aftermath" of World War I. The movement itself is most recognized for the visual art and writings of uncommon imagery. The artists that created works of surrealism painted disconcerting, irrational scenes. They created very strange creatures or things made from everyday objects. The artists had also came up with painting techniques that helped the more unconscious part of your mind express itself.
Some works of surrealism have the element of surprise and no logical flow or pattern. It is said the aim of surrealism was to "resolve the previously contradictory conditions of dream and reality into an absolute reality, a super-reality", aka surrealism.
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There is a lot to surrealism and can be very confusing, but I hope this helps!