Graphic design is a discipline in which graphic signs (illustration, form, typography, color, etc.) are manipulated to create visual objects on different media (brand identities, edition, signage, poster, digital product and service, etc.) according to an intentionality.
Interaction Design is a discipline which cover all the perceptible aspects of the interaction between people and an organization, its products and services through the use of a human centered approach. It involves the usability but also the emotional impact felt during the interaction.