Becoming a full-stack developer requires expertise in both front-end and back-end web development, which includes understanding essential programming languages and frameworks like HTML, CSS, JavaScript, Java, and SQL. Full-stack developers are in high demand due to their versatility, enabling them to handle diverse projects and improving communication within teams. In India, salaries for full-stack developers vary based on experience, with fresh graduates earning around ₹2.4 lakhs annually, while seasoned developers can earn up to ₹17 lakhs.