The term Internet is actually the short term for International Network or Interconnected Network which is a system of interconnected networks using standardized communication protocols such as TCP/IP which stands for Transfer Control Protocol and Internet Protocol.
Writing about the history of the internet is enough to fill a book, and you might get bored along the way, but I will like you to read a brief history of the internet available at the sciencenode website.
And if a video is kind of your thing, you can watch this short YouTube video
The internet contains lots of technologies and services, some of which are
- Internet Forums
- Social Networking
- Online Shopping
E-mail short for electronic mail is a medium for sending messages using electronic devices. For further explanation on this subject checkout computerhope dictionary on what email is.
Internet forums serve as a medium where users can have a discussion on their topic of interest in the form of posted messages.
The term is quite self-explanatory, you go shopping, but not to a local store rather than a virtual store accessible via a computer with a browser and internet connection. An example is Amazon.
Other services you can find on the internet include:
- Web-enabled audio/video conferencing services
- Online movies and gaming
- Data transfer/file-sharing, often through File Transfer Protocol (FTP)
- Instant messaging
- Online shopping
- Financial services
The above list is taken from techopedia definition of the term internet
Edited March 23, 2021: Grammar fix.