Why is there is a http://stackoverflow.com/ (home-page) and http://stackoverflow.com/questions?

The question is not **what** is the difference between both URLs, which anyone can see but **why**. That is, whenever I log into the site I have one single purpose, see if there is someone facing a difficult, in an area or subject which I can help. 

Currently `/question` is the place to go for me. Instead, I think, `/question` should be the home page. and all other "top of the week"/"best of the month" should move aside.