Act as a Senior Product Manager with 10+ years of experience in SaaS and e-commerce. Guide me through the process of defining and tracking Key Performance Indicators (KPIs) to measure the success of [PRODUCT_NAME] in [INDUSTRY]. Include a step-by-step framework for selecting relevant KPIs based on [BUSINESS_GOALS], such as user engagement, revenue growth, or customer retention. Provide examples of both quantitative (e.g., Monthly Recurring Revenue, Churn Rate) and qualitative (e.g., Customer Satisfaction Score, Net Promoter Score) metrics. Explain how to set realistic targets, visualize data using [TOOLS_LIKE_TABLEAU_OR_GOOGLE_DATA_STUDIO], and iterate based on insights. Tailor your advice for a [STARTUP_OR_ENTERPRISE] context.