Tulving (1972) - proposed a distinction between episodic, semantic and procedural memory.
Procedural Memory: Part of the long-term memory is responsible for how to do things i.e. memory of motor skills. It doesn’t involve conscious (i.e. it’s unconscious automatic) thought. For example, procedural memory would involve knowledge of how to ride a bicycle.
Semantic Memory: Part of the long-term memory responsible for storing information about the world. This includes knowledge about the meaning of words, as well as general knowledge. For example, London is the capital of England. It involves conscious thought and is declarative.
Episodic Memory: Part of the long-term memory responsible for storing information about events that we have experienced in our lives. It involves conscious thought and is declarative. An example would be a memory of our first day at school.