instant messaging
Definition:
See instant message.
Here's a word you may not know...
ringtone
A ringtone is a sound or music clip that replaces the standard ring sound on a mobile phone. Many mobile phones can have multiple ringtones which allows you to associate specific ringtones with specific callers in your mobile phone contact list. Ringtones can be purchased over the Internet and downloaded to your mobile phone or in some cases, ringtones can be purchased directly from your mobile phone.