**Read the article Understanding Mainnet and Testnet by [OrderlyNetwork](https://near.social/mob.near/widget/ProfilePage?accountId=orderlylabs.near)** -- This article is about two essential aspects of blockchain development. It explains the difference between them and why they are important. The article also mentions the history of testnets, starting from the early days of Bitcoin's testnets to Ethereum's various testnets like Olympic, Morden, Ropsten, Kovan, Rinkeby, and Goerli. Each of these testnets had specific purposes and contributed to the development of the Ethereum ecosystem. **Article:** **[Understanding Mainnet and Testnet: A Brief History and Practical Guide for Blockchain Development](https://medium.com/@orderlynetwork/understanding-mainnet-and-testnet-a-brief-history-and-practical-guide-for-blockchain-development-11c0e307582)**