A developer is a person who creates software applications or websites. They use programming languages like Python, Java, or JavaScript to write code that makes technology work. Developers can specialize in different areas, such as web development, mobile app development, or game development, depending on what they enjoy and the skills they have. In addition to writing code, developers often collaborate with other professionals, like designers and project managers, to ensure that the final product meets user needs. They also test their applications to fix any bugs and improve performance, making sure everything runs smoothly for users.