Long-term memory is not a single, unitary store. There are potentially many different long-term stores which may be represented by separate brain systems.
Tulving proposed that there are three different types of long term memory stores.
Declarative memory (episodic and semantic) are known as explicit memory as it refers to memories which a consciously recalled.
Procedural memory (implicit memory) and sometimes known as muscle memory, are not consciously recalled.
The episodic memory recalls events from our lives. These memories are time stamped, so you remember when they happened. You have to make a conscious effort to recall these memories.
Semantic memory stores knowledge of the world, such as facts. These memories are not time stamped. Semantic is less personal and more about facts, and is constantly being added to.
Procedural memory is our memory of actions, skills. We recall these without conscious awareness. Muscle memory.
