The internet is a global network (or net’) of inter-connected computers.
The internet provides the infrastructure through which software applications or services such as email, chatrooms and instant messaging operate.
Although in casual conversation used interchangeably with ‘web’, ‘internet’ and ‘web’ have different meanings.
As an analogy: a fax is sent across a telephone line, but a fax is not a telephone line.
The common-knowledge understanding of ‘internet’ and ‘web’ is often satirised with the portmanteau word ‘inter-web’; as in: “I was just looking on the inter-web thingy”.
: DNS, IP address, server, web