Mainnet
Mainnet refers to the production-ready version of a blockchain protocol where transactions are validated, recorded, and stored permanently on the blockchain. In other words, it is the primary network of a blockchain where all the nodes communicate with each other and run the same consensus algorithm to maintain the integrity of the blockchain.
Mainnet is important because it is the live version of the blockchain that is being used by actual users to conduct transactions. It is the final stage of development for a blockchain project after completing testing on a test network. The launch of a mainnet indicates that the project is ready for mainstream adoption and can handle a high volume of transactions without any glitches or bugs. It also signifies the beginning of the real-life use cases of the blockchain, such as making payments, smart contracts, and other decentralized applications.