Eepsites are websites in the I2P network, which means you can only access them with I2P. The official FAQ says: An eepsite is a website that is hosted anonymously, a hidden service which is accessible through your web browser.
What is the meaning of Eepsite?
Eepsites are websites that are hosted anonymously within the I2P network. Eepsite names end in . i2p, such as ugha. i2p or forum.
Can I2P be traced?
The Invisible Internet Project (I2P) is a fully encrypted private network layer. It protects your activity and location. Every day people use the network to connect with people without worry of being tracked or their data being collected.