The product lifecycle consists of four stages: introduction, growth, maturity, and decline. Each stage has different goals, challenges, and opportunities for addressing technical debt. In the introduction stage, you want to validate your product idea, test your assumptions, and get feedback from early adopters. Technical debt is inevitable, but you should prioritize the features and functionalities that are essential for your product-market fit and avoid over-engineering. In the growth stage, you want to scale your product, reach new markets, and increase your revenue. Technical debt can slow down your innovation and growth, so you should invest in refactoring, optimizing, and documenting your code, as well as improving your testing and deployment processes. In the maturity stage, you want to maintain your market share, retain your customers, and expand your product portfolio. Technical debt can erode your competitive advantage and customer loyalty, so you should focus on enhancing your product quality, security, and usability, as well as exploring new technologies and trends. In the decline stage, you want to reduce your costs, optimize your resources, and prepare for your product sunset. Technical debt can increase your maintenance and support expenses, so you should eliminate or consolidate the features and functionalities that are no longer relevant or profitable for your product.