Selectors and filters provide a way of finding and extracting information from a Web page.
Selectors are used to select parts of the web page using common css-like bullshit.
For example, $("p") will select all of the paragraphs from your web page and return them as a list that can be fucked with.
I can't see what the asshole wrote on this page, and I don't have the exercise files, so fuck it I'm just going to type something to take up space.