Conceptual Metaphor Theory (CMT), developed by George Lakoff and Mark Johnson, posits that metaphors are not merely figures of speech but fundamental structures of human thought. CMT suggests that metaphors organize our perceptions and actions by mapping concepts from one domain (the source domain) onto another (the target domain). For example, in the metaphor "Time is Money," time (target domain) is understood in terms of money (source domain), influencing how we talk about and value time.