This document discusses different types of audiences and how to effectively communicate based on the audience. There are four main types of audiences: high-tech, low-tech, lay, and multiple. A high-tech audience is very familiar with the topic, while a lay audience has no knowledge. It is important to define technical terms, jargon, and acronyms depending on the audience. For a high-tech audience fewer definitions are needed, while a lay audience requires more background information and thorough definitions. When writing for multiple audiences, both background information and clear definitions of terms should be provided. Personalizing the tone and explaining the reader benefit can help increase audience involvement.