Chomsky's theory of Universal Grammar posits that all languages share a fundamental set of rules and principles that govern their structure. This shared foundation, according to Chomsky, explains why humans are able to acquire language so easily and why there are certain universal patterns across languages.
While Chomsky's ideas have been influential and have sparked much research in linguistics, they are not without controversy. Some linguists argue that the similarities between languages are more superficial than Chomsky suggests, and that there is more diversity in language structure than his theory allows.
However, Chomsky's work has undeniably made a significant contribution to the understanding of human language and its acquisition.