There's a good chance that you'll come across websites at some point in your career as a system administrator or developer.
Websites are these things that exist on the internet, where people go to find stuff (technical description). Most of the web runs on Linux, with segmented and darker corners for Windows et al.
It's typical for a lot of people to start their Linux careers working for either an ISP or a web host of some sort, meaning that a lot of newcomers to the field get thrown into the deep end of having to manage very public websites immediately. This isn't a bad thing, as you tend to learn quickly in environments with a variety of issues, and when you're surrounded by a host of other people who are all experiencing the same frustration day in, day out, it can be quite the learning experience.