A coder, or software developer, designs, writes, tests, and debugs software applications or programs. They start by understanding user requirements, then create a software solution to meet those needs. This involves writing code in a variety of programming languages like Java, Python, or C++. They also identify and fix bugs, ensuring the software runs smoothly and efficiently. Coders often work in teams, collaborating with other developers, designers, and stakeholders. They continually update their knowledge and skills to keep up with rapidly changing technology trends. Their ultimate goal is to create functional, efficient, and secure software.