email

Definition:

An email is an electronic message sent from one person to another person, or group of people, usually transmitted over the Internet. Initially, the majority of email was transmitted from one computer to another but today email can be transmitted to and from several electronic devices, including smart phones. Email is very popular due to its near immediately delivery and the zero cost associated with sending or receiving email.

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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.