instant message

Definition:

An instant message is a message exchanged between two or more people over the Internet. Messages are delivered instantly (hence the name) and can be replied to as quickly as sending. This exchange of messages is called chatting and is a very popular method for communicating over the Internet. Several different instant messaging applications exist that allow you to send and receive instant messages as well as monitor the online status of your friends, or buddies, who you want to communicate with.

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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.