Knowledge retention is the academic concept and research field concerned with the processes and factors by which information, skills, or understanding are encoded, stored, and remain accessible over time within individuals, groups, or systems. This concept investigates the mechanisms influencing the persistence, transfer, and retrieval of knowledge, exploring phenomena such as forgetting, relearning, and the effectiveness of various strategies and environments in preserving intellectual capital, highlighting its significance for learning, organizational memory, performance, and continuity across diverse domains.