What is the name of the theory that...?

Question: What is the name of the theory that!.!.!.!?

my teacher told me a name for it last school year but i forget!.!.!.the theory that maybe everything around you is just your imagination and not really there!.!.or that you are just someones imagination and your not realWww@QuestionHome@Com

Best Answer - Chosen by Asker:

solipsismWww@QuestionHome@Com

Plato's Allegory of the Cave in the Republic Book 7Www@QuestionHome@Com