The concept of a blockbuster picture was first introduced in the mid-1970s and has been a staple of cinematic history ever since. The industry’s dynamic was changing, and studios recognized the monetary potential of high-concept productions with heavy budgets and large-scale narratives. Steven Spielberg’s fabled 1975 thriller Jaws is generally considered the first example of this style of filmmaking. The movie had a massive marketing effort and an easily understandable spectacle, so consequently, it garnered a community of spectators. All of these factors came together to create huge economic success.

https://screenrant.com/highest-grossing-sequel-movies-of-all-time-list/