The definition of an institution is an established custom or practice, or a group of people that was formed for a specific reason or a building that houses the group of people. Marriage is an example of a cultural institution.
Contextual targeting is a type of targeting on the Google Display Network in which you select specific keywords or topics and then allow AdWords to identify websites that are a good fit for your keywords and targets.
Target marketing orients all of the various components of the marketing function toward a single group, maximizing the appeal of brands to specific markets. The term target audience is a bit narrower; it refers specifically to the group of consumers targeted by advertisements. Outside of the context of business, target audience can also refer to the specific group of people targeted by television shows, movies and music products.