How is computer networks used in marketing and sales, financial services, teleconferencing?

Computer network have led to a new age of all of these services. They have helped in the following way to individual sector:

 Marketing and sales:  Computer networks are used extensively in both marketing and sales organizations. Marketing professionals use them to collect, exchange, and examine data related to customer requires and product development cycles. Sales application includes teleshopping, which uses order-entry computers or telephones linked to order processing network, and online-reservation services for hotels, airlines and so on.

 Financial services:  Today's financial services are totally depended on computer networks. Application contains credit history searches, foreign exchange and investment services, and electronic fund transfer, which permit user to transfer money without going into a bank (an automated teller machine is an instance of electronic fund transfer, automatic pay-check is another).

Teleconferencing: Teleconferencing permits conference to occur without the participants being in the similar place. Applications include simple text conferencing (where participants communicate by their normal keyboards and monitor) and video conferencing where participants can even see as well as talk to other fellow participants. Dissimilar types of equipments are used for video conferencing depending on what quality of the motion you need to capture (whether you require just to see the face of other fellow participants or do you require to see the exact facial expression).