Bump into "Stacks"

When I first switch to Mac, I was quite confuse of the whole dock idea. (sorry, I was a windows user for more than 10 years.)

It is undeniably intuitive, however, I just don't understand the whole curvy pop-up list and .

Then, I found this reference: Mac 101: Stacks

Just to share... :)

p/s:
- I am still very new to blogging, so am trying few features here and there to see the output.
- This post may not be very informative. Anyway, just treat it as FYI.