Memory is the storage of information. Registration is the first step of forming new memories, and is followed by encoding (medial temporal lobe & amygdala) and consolidation. Retrieval of memories uses frontal subcortical systems.
Declarative memories enter consciousness and can be verbalized. They can be formed after a single encounter. Examples include:
Nondeclarative memories are largely unconscious and usualy require repetition for their strengthening. Examples include:
Memory is the product of neural plasticity and biochemical storage. Many mechanisms are used, though synapses appear to be a key site of memory in the brain.