ok, a jpeg is a type of picture. if you have a picture on your pc and you highlight(hold your mouse over) it, it'll say waht typr of file it is(ex: gif, jpeg, etc.) pixels are the smae way, they are a very small unit of measurment, like a computer's inches. you will also see the pixel size when you highlight a pic.(and if you highlight a pic on an image search(yahoo, google, msn). kb is short for kilobytes, or 1,000 bytes. tey are a unit of file size, the best example i can make of that is sort of like pounds) above a certain size, you can use it. this is also displayed whwn you highlight the pic. if thats confusing, thats the best i can put it, sorry.
EDIT-sorry about the double post mods!
I'm baaaack...