I use a train to get to work every day, but I don't really know anything about how the technology works (beyond a superficial level, the same degree of trivial superficiality whereby I know that Khartoum is the capital city of Sudan)

Even if I didn't know the word 'train' I think most reasonable users of English would still agree that I know what a train is.

People who use a browser to go on the web, even if they don't know the name for the category of application they are using is "browser" and all the technical functioning of the browser and how the internet works, can be said in normal English usage to know what a browser is - it is one of a class of applications that they use to go on the web.

They click on an icon, a window opens up they go on the internet. The "browser"