Semiotics means the study of signs and symbols and their use or interpretation.
Denotation means the literal or primary meaning of a word, in contrast to the feelings or ideas that the word suggests.
Conotation means the idea that a word invokes to a person in contrast to the actual meaning of the word.
For example in this commercial image of the panzani. The first thing that comes to mind when you think of pasta is the Italians yet the cover clearly