Define the term 'Shader Graph' in Unity.

Shader Graph in Unity refers to a visual tool designed for creating and editing shaders without requiring extensive coding knowledge. By employing a node-based interface, artists and developers can construct complex visual effects by connecting different nodes that represent various operations, textures, colors, and mathematical functions. This allows users to intuitively design and adjust shaders in real-time, facilitating creativity in visual effect creation.

The ability to manipulate parameters visually makes Shader Graph accessible for those who may not be familiar with shader programming languages, thus streamlining the workflow for creating customized visual effects in Unity projects.