A Mainnet is the primary network where a blockchain operates and transactions are executed. It is the fully functional version of a blockchain, allowing users to send and receive cryptocurrency, interact with smart contracts, and participate in decentralized applications. Unlike testnets, which are used for testing and development, the Mainnet is where real assets and value are at stake. When a blockchain project launches its Mainnet, it often signifies a significant milestone, as it indicates that the technology is ready for public use. Users can engage with the network using its native cryptocurrency, such as Bitcoin or Ethereum, and developers can build applications that leverage the blockchain's capabilities.