Front-end is a term that involves the building of webpages and user interfaces for web-applications.
In other word The website’s front end is everything you see and can interact with using a browser. So, creating this visual part is called front-end development.
The basic toolset for a front-end is well-defined: HTML, CSS, and JavaScript. The frontend development technologies may be however extended with package managers, CSS preprocessors, frameworks, and many mores.