Solipsism 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.
Bibliography
“Solipsism.” 2023. Wikipedia, January. https://en.wikipedia.org/w/index.php?title=Solipsism&oldid=1134581724.