It is not an easily defined single object. The Internet is not a single company or a group of companies, nor even a single network. The Internet is different from other major services.
Electricity tends to be provided by a single company in each geographical area.
But in general there is more than one Internet provider in any locale, and there are usually many paths from a local provider in one area to a provider in another area. When you, the user, look at a web page through the Internet, many things happen along the way. All these access methods are onramps to the information superhighway. In order to transmit text or pictures, your data is chopped up into small packets which are routed through the Internet. This local ISP is a possible point of failure.