A heavily advertised new movie will have posters, trailers, and commercials broadcast and posted everywhere to get the attention of the public and generate excitement.
When a product, service, or event is advertised, it's been promoted to attract attention and interest. Think of colorful posters for a new movie or catchy jingles for a fun toy on TV. Advertising spreads the word and gets people interested in what's being offered. An advertised sale, cool gadget, or event is most likely known to many people because it's been publicized to reach a broad audience and maximize market awareness.