newbie question about webpages

I don't want my site to end with .html or .php, how do I get the pages to end in a nice slash?

example: http://strobe.cc/quodlibot/

so, for every single site out there who's webpages end in no url path of .html or .php such as iam.com/newb then they are either using mod_rewrite, a web framework (which sounds like you can't code to me, what does that mean?), or by using the oldschool method of putting an index file into a directory?