Software engineers are professionals who design, develop, and maintain computer programs and applications. They use programming languages like Python, Java, and C++ to create software that helps solve problems or improve processes. Their work can range from building mobile apps to developing complex systems for businesses. In addition to coding, software engineers often collaborate with other team members, such as project managers and designers, to ensure that the final product meets user needs. They also test and debug their software to fix any issues, making sure it runs smoothly and efficiently for users.