Testnet

A testnet is a practice blockchain that runs the same software as the real network, called mainnet, but uses free tokens that are worth nothing. Developers use it to deploy contracts, try out apps, and break things without losing money. Ethereum has Sepolia and Holesky, Solana has devnet and testnet clusters, and most other chains run their own.

Testnet coins come from faucets, which hand out small amounts to anyone who asks. Because the network is separate, a token or contract on a testnet has no link to mainnet, and balances cannot be moved between the two. Testnets are sometimes reset, so whatever was deployed there can disappear.

For token buyers, the main relevance is that a project running on testnet has not launched for real yet. Teams often run a public testnet before mainnet, and some later reward early testers with an airdrop, which is why people farm testnets. Testnet activity, user counts, or transaction numbers say little about real demand, since everything there is free.

The common traps are scams that blur the line. Someone may sell "testnet tokens" for real money, or promise that testnet coins will convert to mainnet coins, which is almost never how it works. Fake faucets and fake testnet sites can ask you to connect a mainnet wallet and sign approvals. Use a separate wallet for testnet experiments and never enter a seed phrase anywhere to receive test coins.