Online fonts, such as Google Fonts, are a collection of free fonts that can easily be added to a website with just a few lines of code. Using these fonts allows for a variety of design options and customization for individual needs. There is a wide range of styles available, from classic and elegant to modern and avant-garde. All you have to do is choose the appropriate font from the Google Fonts library and add it to your site with the appropriate code. This simple and quick solution allows for fast and easy customization of the look of your website to fit your needs.