Kilobyte (or Kb) is smallest. Megabyte (or Mb) is larger (about 1/3 of a song) Gigabyte (or Gb) is pretty large (Computers now have between 40 and 100 GB) Terabyte (or Tb) is the largest and some web-hosting sites will allow you that much storage for a webpage, videos, music, etc. I hope that helped... and remember.