The idea of the summer blockbuster didn't really exist before Jaws premiered in June 1975. Upon its release, Jaws was the highest-grossing film of all time. Its success set the standard for action and adventure films in Hollywood. After Jaws, summer movies were expected to have simple but exciting premises, cutting-edge special effects, stimulating music, and quality production. The idea of extensive advertising and wide distribution to promote a film for summer was modeled largely after the approach that Universal Pictures employed for Jaws.
Source：https://www.cbr.com/jaws-biggest-changes-book-movie/
