A neologism is a newly coined word or expression that is often created to describe new phenomena or concepts. Language is constantly evolving, and neologisms can emerge from various sources, including technology, popular culture, and social trends. For example, the word "selfie," referring to a self-portrait photograph typically taken with a smartphone, is a neologism that gained widespread use in the 21st century. Neologisms can reflect societal changes and technological advances, offering insights into how language adapts to meet new communicative needs.