Learn about environment variables and their functionality in this comprehensive 30-minute tutorial. Discover what environment variables are, how they work, and how to manage them effectively. Explore methods for listing, printing, setting, and unsetting environment variables on both Windows and macOS. Gain insights into common environment variables and important facts about their usage. Master the concept of name-value pairs and understand how environment variables are utilized at runtime. By the end of this tutorial, you'll have a solid understanding of environment variables and their practical applications in various operating systems.