📌 Ether Currency Units

Ethereum's currency unit is called ether, identified also as "ETH". Ether is subdivided into smaller units, down to the smallest unit possible, which is named wei. One ether is 1 quintillion wei (1 * $10^{18}$ or 1,000,000,000,000,000,000).

The value of ether is always represented internally in Ethereum as an unsigned integer value denominated in wei. When you transact 1 ether, the transaction encodes 1000000000000000000 wei as the value.

📌 Ethereum Networks

Main Ethereum Network

• The main public Ethereum blockchain. Real ETH, real value, and real consequences.

Ropsten Test Network

• Ethereum public test blockchain and network. ETH on this network has no value.

Kovan Test Network

• Ethereum public test blockchain and network using the Aura consensus protocol with proof of authority. ETH on this network has no value. The Kovan test network is supported by Parity only.

Rinkeby Test Network

• Ethereum public test blockchain and network, using the Clique consensus protocol with proof of authority. ETH on this network has no value.