The term "Gettier" refers to a philosophical problem introduced by Edmund Gettier in 1963. It challenges the traditional definition of knowledge as "justified true belief." Gettier presented scenarios where individuals have beliefs that are true and justified, yet intuitively do not qualify as knowledge. These scenarios, known as Gettier cases, demonstrate that having justified true belief is not sufficient for knowledge. This has led to significant discussions in epistemology, prompting philosophers to seek a more robust definition of knowledge that addresses the shortcomings highlighted by Gettier's examples.