knitting question

[cookiezs.livejournal.com]

i dont understand, when you are knitting how do you accidentally make more stitches?? i started out with 40 stitches and ive only done about 6 rows and i have 44 stitches. are you not supposed to knit the last stitch? or what is it thats giving me these extra stitches?

thanks ahead of time =)