What is Gemini?
Gemini is a new, collaboratively designed internet protocol, which explores the space inbetween gopher and the web, striving to address (perceived) limitations of one while avoiding the (undeniable) pitfalls of the other.
While it is significantly lighter than the web, it does not aim to replace it, and takes user privacy seriously.
Read more here: https://gemini.circumlunar.space
To view Gemini capsules, you will need a client, many are listed here. I can personally recommend Lagrange (GUI) and Amfora (terminal).