Change blindness is a psychological phenomenon where a person fails to notice significant changes in their visual environment. This occurs because our attention is limited, and we often focus on specific details while overlooking others. As a result, even large alterations can go unnoticed if they happen during a visual disruption, such as a blink or a brief distraction. This effect highlights the limitations of human perception and attention. For example, in experiments, participants may not notice when a person they are talking to is replaced by another individual. Such findings have implications for fields like cognitive psychology and human-computer interaction, emphasizing the importance of attention in visual processing.