This lecture introduces the Market Opportunity Navigator, a tool designed for innovators and entrepreneurs to identify the most suitable markets to enter. The instructor addresses common questions related to market selection and explains the relevance of the Navigator in guiding startups through the process. The lecture emphasizes the importance of engaging in this market selection process despite time constraints, challenging the common assumption of a 'laser sharp focus' approach. Participants are encouraged to actively participate in the practical application of the concepts discussed.