The Internet is a global system of interconnected computer networks that use the standard Internet protocol suite (TCP/IP) to serve billions of users worldwide.
At the current state of affairs all or nearly all computers connected to the Internet are using Internet Protocol as a basis of communications. The Internet Protocol Suite uses OSI layers which defines 7 protocol layers. The users commonly only aware of the highest aka Application Layer which defines protocols like HTTP, SMTP, DHCP, which make World-Wide Web, Email, and Dynamic Address configuration such as address assignment by the BroadBand connections possible.
Businesses can use these as tools for reaching their customers to inform them of changes to products, investment information, and to sell them products. These tools also used to receive feedback from customers as well.