Frontend

The frontend of a software program or website is everything with which the user interacts. From a user standpoint, the frontend is synonymous with the user interface. From a developer standpoint, it is the interface design and the programming that makes the interface function. Conversely, the backend includes functions and data processing that takes place behind the scenes.

One of the primary goals of frontend development is to create a smooth or "frictionless" user experience. In other words, the front end of an application or website should be intuitive and easy to use. While this sounds like a simple goal, it can be surprisingly complex since not all users or devices are the same. For example, an app developed for a mobile device requires a significantly different frontend than a desktop application. Websites must work well on multiple devices and screen sizes, which is why modern web development typically involves responsive design.