The document discusses various ways to define an audience, including through research methods, demographics, and psychographics. There are two main types of research - quantitative and qualitative. Quantitative research uses numbers and statistics from surveys, while qualitative research seeks to understand opinions through interviews and open-ended questions. Important audience dimensions to define include age, gender, social grade, geographic location, and psychographic profiles that describe personality types. Together, researching these factors helps precisely target an audience for a product or message.