## 22.1 Introduction

In this chapter we talk about differential graded algebras, modules, categories, etc. A basic reference is [Keller-Deriving]. A survey paper is [Keller-survey].

Since we do not worry about length of exposition in the Stacks project we first develop the material in the setting of categories of differential graded modules. After that we redo the constructions in the setting of differential graded modules over differential graded categories.

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