What is Chapter 4 about?

Chapter Four is set at one of Gatsby's parties. In this chapter, we are exposed to Gatsby's rumored past, apprised of his previous relationship with Daisy and convinced that Daisy is the reason he's come to the Egg. For a complete and detailed summary and analysis of the chapter, check out the Gradesaver link below.

http://www.gradesaver.com/the-great-gatsby/study-guide/summary-chapter-4