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Long-term memory divides into explicit and implicit memory. Explicit memory, or declarative memory, involves conscious recollection of events and facts that can be verbally communicated, such as recalling a movie plot. Implicit or non-declarative memory includes memories of how to perform tasks like riding a bicycle without conscious thought.

Episodic memory retains details about personal experiences, including the time, place, and events—such as your first day at college or breakfast this morning. Semantic memory encompasses general knowledge about the world, including expertise, historical facts, and everyday knowledge, such as understanding chess rules or recognizing notable figures.

Implicit memory, or non-declarative memory, affects behavior through previous experiences without conscious recollection. It enables performance of skilled tasks like playing tennis or text messaging without consciously recalling the learning process. These memories operate below conscious awareness and are integral to daily activities and skilled performances.

Long-term memory stores vast amounts of information for extended periods with generally unlimited storage capacity. Unlike shorter-duration memory systems, LTM retains information relatively permanently, allowing individuals to maintain knowledge, skills, and personal experiences over years or a lifetime without degradation.

Semantic memory includes knowledge acquired in school and everyday understanding, such as knowing the rules of chess, principles of geometry, or recognizing the Dalai Lama. It encompasses expertise, general knowledge about meanings of words, notable people, significant places, and common objects we encounter daily.

Episodic memory is autobiographical, retaining the where, when, and what of life's events. It includes personal experiences such as details of where you were when a sibling was born, what happened on your first date, or what you ate for breakfast, essentially providing a mental diary of personal history.

Implicit memory enables individuals to perform complex tasks and skills without conscious recollection of the learning process. Activities like snowboarding, playing tennis, or text messaging rely on implicit memories operating below conscious awareness, making these skilled performances automatic and efficient in daily life and work.