What is a Testnet?
A testnet or test network is a type of network that can provide functionalities similar to that of a main network (mainnet). Developers can use testnet as a simulated version of mainnet to test, modify, or create projects on blockchain networks. 

Testing or implementing new features on the mainnet can be highly risky and irreversible in case of any errors. So, blockchain developers first conduct the trials on the testnet to monitor the functioning before adding it live on the mainnet. 

Testnets, therefore, play a crucial role in advancing blockchain projects. For example, if a dApp needs refinement, developers can experiment with different options on a testnet and even ask for feedback from their community before implementation.

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