The terms "coder", "programmer", "developer", and "software engineer" are often used interchangeably, but they can have slightly different connotations.

Let's discuss them one by one:

1.) Coder: A "coder" is someone who writes code, or computer instructions, that a computer can understand and execute. "Coder" is often used in a broader sense and can refer to anyone who writes code, regardless of their level of experience or expertise.

2.) Programmer: A "programmer" is someone who writes code to create software programs, applications, and systems. This term is often used to describe someone who is more experienced and knowledgeable about programming concepts and practices. Programmers do not develop or design or invent anything new, they just use existing languages like C, C++, JAVA, Python, etc., and they are experts in those languages.

3.) Developer: They are programmers to a greater or lesser extent. They write code to create software programs, applications, and systems. They have a wider range of responsibilities, including design, coding, testing, and debugging.

4.) Software Engineer: A "software engineer" is someone who applies engineering principles to the design, development, testing, and maintenance of software. This term is often used to describe someone who has a more formal education in computer science or software engineering and who brings a higher level of expertise and professionalism to the software development process.

In general, the distinction between these terms can be subtle and depends on the context in which they are used. However, all of these terms describe individuals who write code and play an important role in creating software.