Difference between 'pk' and Money Line?

I am wondering what is the difference? For example, on Tuesday Italy plays Uruguay....On Pinnacle, looking at Italy, they will pay 1.943 as a 'pk', but will pay 2.72 on the Money Line. Can somebody with soccer betting knowledge superior to mine please explain to me the difference? Thank you  

If you choose pk: You push if the game ends 1-1.

I see, thank you jkatakoon...it seems that the pk bet is a good way to go in soccer!

The problem is with pk lines is it's way juiced up over the ML..

What's the difference when something is -.5 at -120 or ML at -130 

-0.5 and ML is the same thing.

Let me tell you how many games ive lost by betting ML instead
of PK. I cant count that high!
I'm not saying to always bet the PK because there are times when it is quite chalky but in world cup where teams are very close often it is an advisable play! I think there have been 6 draws in world cup thus far but im surprised there are not more draws.

-.5 you lose oif it ties, ML you push. Also in soccet ML you have a draw option so ties  loses