internet
The word 'Internet' is used in German just like in English. It refers to the global network of interconnected computer networks that use the Internet protocol suite (TCP/IP) to communicate with each other. It is a vast collection of interconnected networks, including the World Wide Web, email, and file transfer protocols.
I use the Internet for learning.
In this sentence, 'das Internet' is being used to state the medium through which the speaker is learning. It indicates that the speaker uses the Internet as a resource for education.
This sentence conveys the fact that 'das Internet', in this context, is used as a tool or medium for purchasing a book. It signifies that the person is buying the book online, rather than in a physical store.
None
She finds her information on the Internet.
In this example, 'im Internet' is referring to the place or platform where the woman is finding her information. It suggests that she is using the Internet as a source of information, possibly for research or general knowledge.