Pattern question - yarn forward

i can figure out that “yarn forward” means to bring the yarn to the front of the work, but what does this mean?

Yf – yarn forward (increase)

the pattern then goes on to say: Row 1: k1, yf, k11, [yf, k1] twice, yf, k11, yf, k1…

is it a yarn over, or what? someone please hlep me figure this out!

Yes, it is the same as yarn over.