<human>:  What is the difference between a front-end developer and a back-end developer?
<bot>: The primary difference between a front-end developer and a back-end developer is the type of work they do. Front-end developers work primarily with the design and user interfaces of websites and applications, while back-end developers focus more on the server-side, database, and other infrastructure related technologies. Front-end developers usually create the visuals and interactivity that are seen and experienced directly by users, whereas back-end developers handle the behind-the-scenes architecture and data processing.