There are a number of different instant web messaging programs available, also known as Instant messaging software or an IM client.
The big names include MSN Messenger from Microsoft, Yahoo! Instant Messenger (Oh come on, you should be able to tell who this is from), AOL Instant Messenger (ditto), ICQ (now part of AOL) and Google's gTalk which is the newest.
People from all around the globe are able to maintain international friendships by using free instant messaging services provided by these companies.
Typical features of Instant Messaging software include text options, image options, file sharing options, as well as online gaming, video, voice & text chatting facilities.