Why are computer networks an important part of today’s information technology systems?

"Today companies use networks of linked computers that share data and expensive hardware to improve operating efficiency. Types of networks include local area networks, wide area networks, and wireless local area networks. A network that connects computers at different sites via telecommunications media such as phone lines, satellites, and microwaves. Intranets are private WANs that allow a company’s employees to communicate quickly with one other and work on joint projects, regardless of their location. Companies are finding new uses for wireless technologies such as tablets, cell phones, and other mobile devices. Private corporate networks connected over a public network, such as the internet. VPNs include strong security measures to allow only authorized users to access the network. Virtual private networks give companies a cost-effective secure connection between remote locations by using public networks such as the internet."