When you put, say, "www.dreamwidth.org" into your web browser, your ISP sometimes has to look up where that address lives on the internet -- like if you had a business's name, and needed to know their address, so you looked them up in the phone book. One "hey, where does this site live" = one query. Now, your ISP remembers addresses for a little while, so it's not "one page load = one DNS query", but your ISP is also paranoid about people moving without telling it, so it looks up addresses pretty frequently!
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When you put, say, "www.dreamwidth.org" into your web browser, your ISP sometimes has to look up where that address lives on the internet -- like if you had a business's name, and needed to know their address, so you looked them up in the phone book. One "hey, where does this site live" = one query. Now, your ISP remembers addresses for a little while, so it's not "one page load = one DNS query", but your ISP is also paranoid about people moving without telling it, so it looks up addresses pretty frequently!