{"id":"testnet","title":"Testnet","content":"**A testnet** (or test network) is a [blockchain](https://iq.wiki/wiki/blockchain) network used to run and test blockchains and blockchain projects before releasing to the [mainnet](https://iq.wiki/wiki/mainnet). It’s a testing ground for programmers and developers to design, edit, and test their project’s functions and track its performance before making it public. [\\[1\\]](#cite-id-kbi0dcr7nv)\\\n$$widget0 [YOUTUBE@VID](3RFz3fsripw)$$\n\n# Overview\n\nTestnet is often used for development. For instance, when creating new functionalities that involve transmitting and receiving [cryptocurrency](https://iq.wiki/wiki/cryptocurrency), [blockchain](https://iq.wiki/wiki/blockchain) testnets serve as accurate replicas of the original protocol, employing identical technology and tools to execute similar tasks. Developers and testers can assess the feasibility of a system by conducting transactions without the risk of actual mainnet funds being at stake. Testnet provides a dynamic and appropriate environment for testing [decentralized applications](https://iq.wiki/wiki/decentralized-application) and [smart contracts](https://iq.wiki/wiki/smart-contract). [\\[1\\]](#cite-id-kbi0dcr7nv)[\\[2\\]](#cite-id-1b6ryer3fsc)\n\n## Ethereum Testnets\n\nFor Ethereum, the two public testnets that client developers maintain are Sepolia and Goerli. Sepolia is a network for contract and application developers to test their applications. The Goerli network lets protocol developers test network upgrades and lets stakers test running validators. [\\[3\\]](#cite-id-jpsispift7m)\\\n$$widget0 [YOUTUBE@VID](gIZCQUatkes)$$\n\n# Use Cases\n\n## Cost\n\nTesting on the [mainnet](https://iq.wiki/wiki/mainnet) incurs frequent [blockchain](https://iq.wiki/wiki/blockchain) fees and potential disruptions, leading to high costs for developers and risks to the [cryptocurrency's](https://iq.wiki/wiki/cryptocurrency) reputation. [\\[1\\]](#cite-id-kbi0dcr7nv)\n\n## Quality Assurance\n\nQuality assurance is vital for deploying high-performing, error-free applications on a network. As organizations adopt a shift-left approach to enhance application quality, test results' validity is significantly influenced by various factors and constraints. Consequently, developers require a test environment that closely resembles [mainnet](https://iq.wiki/wiki/mainnet) conditions. [\\[1\\]](#cite-id-kbi0dcr7nv)\n\n## Compatibility\n\nTest network coins are incompatible with main network currencies, requiring new coins or techniques and making the process more prolonged and costly. Nonetheless, all new projects must be tested on a separate blockchain testnet before release, allowing developers to test every component independently and avoiding disruptions in the [main network](https://iq.wiki/wiki/mainnet). 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