The solipsism is a philosophical theory which asserts that i am the sole existent, the sole true reality. To be a solipsist, I must hold that I alone exist independently, and that what ordinarily call the outside worlds exists only as an object or content of my consciousness.
Classical refutations of Solipsism
This doctrine, if not impossible to hold, is philosophically interesting in that many thinkers have thought it necessary to attempt refutations, or even to admit that, however bizarre, it is strictly irrefutable. Once we concede (following Descartes, Locke and many others) that the immediate objects of sense experience are mind-dependent, it is indeed questionable whether we can argue validly to the existence or nature of a mind-independant-world.
Modern critics of the solipsist theory
Modern critics have, however, challenged the initial premise as misuse of terms; similarly objections have been raised against the use of “I” which eliminates its normal constrasts. And Wittgenstein’s private language argument if valid, in effect makes solipsism incompatible with our having a language to express it.