association is linking of entities to each other. Like a user can be associated with a statup, event. A subject can be associated with a course, exam etc.
Associations can only be done by users having access permissions specific to the entities.
Ads can be text, link, image, flash, popup based on Slot Zone on portal and its services.
Create Ad to link to your product, company, job, institute, classified within Portal or point it to an outside Webpany.