Connotationrefers to the emotional or cultural associations that a word carries, while denotationrefers to the literal or dictionary definition of a word.
Denotation is the specific, exact, and concrete meaning of a word, which can be found in a dictionary.
Connotation is an idea or feeling that a word invokes in addition to its literal or primary meaning, sometimes with social and cultural implications that can be positive or negative.
The word 'blue' has a denotative meaning of a color intermediate between green and violet as of the sky or sea on a sunny day, and a connotative meaning of sadness.
The word 'sheep' has a denotative meaning of a farm animal that is covered with wool, and a connotative meaning of a person who is too easily influenced.