This comprehensive guide explores mainnet as a fundamental concept in blockchain technology, covering its critical role from project launch through real-world implementation. The article traces blockchain evolution from Bitcoin's 2009 pioneer mainnet to modern platforms like Ethereum, Solana, and Polkadot, explaining how mainnet launches validate technological maturity and drive market dynamics. Readers will understand mainnet's technological significance, market impact on cryptocurrency trading, and diverse applications spanning DeFi, NFTs, supply chain management, and digital identity. The guide addresses how users and investors can navigate mainnet launches safely, highlights preparation requirements for projects, and distinguishes mainnets from testnets, providing essential knowledge for anyone involved in blockchain technology or cryptocurrency trading on platforms like Gate.