Sound

Global networks exist that can carry digitalised sound. Such an example would be the Internet. The Internet being a global network made up of smaller networks, interconnection of government, education, and business computer networks that is open to the public. The Internet allows digitalised sound to be transmitted in a range of formats. Web sites exist that allows real time sound to be transmitted, which means, with a good connection you could listen to a radio transmission in real time.

Sounds like a voice is transmitted over global networks. Digitalised voices can be transmitted via a landline over a fiber optic cable or it could be routed through a satellite (an invisible global network)

Video

This type of data can bet transmitted like all the other forms of data, digitalised and sent in a sequence of bits or as a packet of bits. Video is sent as a sequence of frames attached with sound and delay information. Again this data can be transmitted and received in real time. There are Internet web sites that have cameras, These sites will send you the camera's video updating the frames on your browser in real time.

Animations, Images and Text

This type of digitalised data can also be sent through the Internet to your Internet browser. Normally these would be viewed and that's it, but there is a real time application for each. Animations can be viewed, rewound, and forwarded, Images in some DHTML sites, can be used interactively, whereby the user is actually interacting with the images on the site.

Finally text, an example of a real time application here would be the chat rooms and sites found on off the Internet. These sites allow you to communicate with someone by typing messages to one another. This is in real time so it's like actually chatting to someone.