Can I transfer my OS to an SSD

I currently have a 2TB HDD and and looking to get an SSD for my operating system only. However, Windows 8 came on the computer when I purchased it.

So I am wondering if I can somehow transfer my operating system that is currently running on my HDD over to the new SSD when I get one without having to purchase a new copy of windows?
 
Excellent, thank you so much. Now I thought more about it and I would rather just re-install windows on the ssd.

Now my computer did come with windows already installed on it, however there is a Microsoft sticker on the side of the computer that says my product key.

Shouldn't I be able to re-install windows as many times as I want on this computer? Also would I need to get a physical copy of windows to do a fresh install onto the ssd with the key that is on the sticker, on the side of my comp?