Internet is the network of devices which are connected to each other through wires or signals and which communicate to each other. Internet is what makes computers more useful. The idea is that ten connected computers are more useful than ten separate devices. Internet in itself is bare hardware/electronics, Software is what adds value to the internet.
Till very recently we would connect PCs, tabs and phones to internet.However, now we can connect other devices as well. This new idea is known as internet of things, where we have our important home appliances like refrigerators, coffee machines as well as cars connected and accessible over the internet.