Knowledge Retention refers to the ability or process of retaining information that has been learned, understood and internalized. It is about remembering what you have studied, learned or experienced in order to apply it effectively later on. In other words, knowledge retention means keeping your knowledge alive and active so that you can use it when needed. This involves various techniques such as repetition, practice, visualization, mnemonics, etc., which help reinforce the memory of what has been learned. It is an essential part of learning process to ensure that information is not forgotten or lost over time.