Explicit memory can be further deepened into episodic and semantic. Episodic memory is essential memories of episodes in life. It is a complex store; including images, smells, and emotions, and is chronological; remembered to a certain point in life, and also requires active recall to the mind. However semantic memory is conceptual and more abstract knowledge. It is characterised by the fact that the memories are facts and not time stamped. They are usually abstracted from episodic memories and much less vulnerable to misremembering and distortion.