pixel
Definition:
A pixel describes the quality of a digital picture or camera. A pixel is the smallest dot that makes up a picture. The more pixels, or megapixels, that make up a picture, the better the quality of the picture.
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iTunes
iTunes is an application created by Apple. Using iTunes you can listen to music and watch videos both on your computer and on CDs. It also allows you to legally purchase and download digital music, movies, and television episodes as well as transfer music to and from an iPod and subscribe to podcasts.