Megabyte: 1024 Kilobytes, written MB used to refer to size of files or media such as hard drives. Refers to amount of information in a file, or how much information can be contained on a Hard Drive or Disk.

Mega Pixel: 1 Million Pixel Image. Usually produced with high-end digital cameras, and Scanners. The greater the pixel count of an image the higher the resolution of that image .