A "Side Hustle" is a secondary job or business that people pursue in addition to their primary employment to earn extra income. It often involves turning passions, skills, or hobbies into money-making ventures, such as freelancing, selling products online, or offering services. Side hustles provide flexibility, allowing individuals to work on their own terms, build new skills, and explore entrepreneurial opportunities without quitting their main job. It's a popular way to supplement income and achieve financial goals.