Abstract
In this article, we review the AdS/CFT duality for non-experts. Superstring theory has objects so-called D-branes, which are the key to understand the AdS/CFT duality. What is important about the D-brane is that the D-brane has two different descriptions. As I will explain in detail below, the D-brane can be described either by a gauge theory or by a black hole. So, the D-brane connects these two entirely different systems. However, the simplest AdS/CFT duality involves only adjoint matter and there is no fundamental matter such as quarks. Thus, an important question to address if we want to use the AdS/CFT duality for more realistic scenarios is how one can include fundamental matter. I will explain a simple way to describe fundamental matter; Sugimoto discusses more realistic methods in his article (in this volume).
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