To interact with the Ethereum network, you need a unique identifier, which is called an address. Often, you'll find yourself using multiple addresses for various reasons. So, how do you effectively manage them all?

A wallet application is a handy tool for this purpose. One of the most widely-used and popular options is MetaMask.

Ethereum operates on two primary networks:

1. Mainnet: Where Ether (ETH) holds real-world value and production-ready decentralized applications (dApps) are deployed.
2. Testnet: A replica of the Mainnet with lower transaction costs and faster confirmation times, used for testing new protocols and dApps before deploying them on the Mainnet.

Both networks require Ether to cover transaction costs. We'll explore how to acquire Ether on the Mainnet and Testnet (also known as Test Ether).