با سلام
What is the difference between 'internet' and 'Internet'?
internet with a lowercase "i" means any type of network connection(LAN,MAN) where external user can access publicly available resources
Internet with a capital "i" means main public network that most companies and people use when accesing external resources
(Edited)
The "Internet" and the "internet" has no different meaning nor function they both simply consists of multilevel heirarchy of networks, in which client computer has an access to a network's resources.
internet with a lowercase "i" is just a generic term for "Internet", in which are commonly used when referring to an instance of one network(LAN) is connected to another network, it is short for "inter-networks". The term is usually use in an Autonomous System environment.
However, due to the popularity gained by "World Wide Web" as an easy means to access rich information, many peeps use the term "Internet" when they are browsing inside the World Wide Web. Nowadays, "Internet" and "World Wide Web" is used interchangeably, although the World Wide Web is just one of the services offered in the "Internet".
Also, i think the reason why the "Internet" is coined as a proper noun, is because as of now there is only "ONE" largest computer network in our planet and we call that global network as "the Internet".