Defining your target audience in digital marketing involves identifying the specific group of consumers most likely to be interested in your product or service. Start by analyzing your current customer base and identifying common characteristics such as demographics (age, gender, location, income level), psychographics (lifestyle, interests, values), and behavior (purchase history, online activity). Utilize tools like Google Analytics, social media insights, and customer surveys to gather data. Create detailed buyer personas that represent your ideal customers, including their needs, pain points, and buying behaviors. Consider market research and competitor analysis to understand where your audience spends time online and what content they engage with. Continuously refine your target audience based on feedback and data analysis to ensure your marketing efforts are reaching the right people effectively.