More can be said if anyone wishes to add something—particularly about the evolution, legacy, and growing popularity of the Faustian legend—but here are a few former answers that should intrigue you:

• Did the motif of a "devil's bargain" exist in literature prior to Marlowe? What's known about the historical Johann Faust? by /u/sunagainstgold
• More than a dozen different books about him, his influence being felt across German literature and beyond due to his portrayal in Goethe's Faust, what is known about the historical Faust? Why did he become a symbol of making pacts with the devil, does his story have to do something about it? by /u/Strahozor