Cognition is the combination of brain processes that include the ability to learn, remember, and make judgments. It is the ability to gather information, analyze it, and produce the appropriate response.
Cognition is necessary for people to understand their environment and decipher the sensory input they receive.Through childhood and adolescence, cognition is constantly changing and developing.
As people become adults, their neurons start dying. Thus cognitive functions start declining. People who suffer from neuropsychological disorders have to deal with a faster decline of cognitive capabilities.