What is the key feature of pair programming?

The key feature of pair programming is that two programmers collaborate in a way that involves rotating between the roles of coding and directing. In this practice, one programmer, known as the "driver," writes the code while the other, referred to as the "observer" or "navigator," reviews each line of code being produced and provides guidance, suggestions, and support. This collaborative approach fosters communication, enhances problem-solving, and allows the pair to share knowledge and skills. By switching roles regularly, both programmers benefit from increased engagement and the opportunity to develop their abilities in different aspects of the programming process.

This method contrasts with the other options, as they all imply solo work or lack of collaboration, which is not in line with the principles of pair programming. For instance, working alone on a project or creating code separately eliminates the benefits of shared thinking and immediate feedback, while having no discussion during coding contradicts the very essence of collaboration that pair programming embodies.