Networks allow you to share printers, internet connections, files, e-mails and databases. Reducing cost, avoiding duplication and improving efficiency.
Wired networks are secure, fast and reliable. Which is why this is the suggested solution for most circumstances.
Wireless networks are secure, but not as secure as wired networks. Speed is probably about a quarter that of a wired network allowing for average conditions, also distance can be a problem with walls, especially thick walls and metal shielding the signal. The advantage is that cables don’t need to be run between offices and floors, there by reducing the cost of installation.