Front-end developers and back-end developers are both types of software developers, but their roles and responsibilities differ significantly. The main difference between a front-end developer and a back-end developer is the part of the software they work on.

Front-end developers are responsible for the parts of a software application that users see and interact with. This includes the user interface, visual design, and overall user experience. Front-end developers use programming languages such as HTML, CSS, and JavaScript to create responsive, interactive, and visually appealing web pages and applications.

Back-end developers, on the other hand, are responsible for the parts of a software application that are hidden from the user. This includes the server-side logic, databases, and APIs that power the application. Back-end developers use programming languages such as Python, Java, and PHP to develop the functionality and performance of an application.

To summarize, front-end developers are focused on creating a user-friendly and visually appealing interface, while back-end developers are focused on creating a robust and secure server-side infrastructure to power the application. Both types of developers are essential in the software development process, and often work together to create a complete application.