A Developer is a person who creates software applications or systems. They write code, which is a set of instructions that tells computers what to do. Developers can work on various projects, from mobile apps to websites, and they often use programming languages like Python, Java, or JavaScript to build their products. In addition to writing code, developers also test and debug their applications to ensure they work correctly. They often collaborate with other professionals, such as designers and project managers, to bring their ideas to life. Overall, developers play a crucial role in the technology we use every day.