Solipsism

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Solipsism (/ˈsɒlɪpsɪzəm/ ^ⓘ SOLL-ip-siz-əm; from Latin solus 'alone', and ipse 'self')^[1] is the philosophical idea that only one's mind is sure to exist. As an epistemological position, solipsism holds that knowledge of anything outside one's own mind is unsure; the external world and other minds cannot be known and might not exist outside the mind.