---
title: Testnet
url: "https://www.unknowngravity.com/en/glosario/testnet"
site: Unknown Gravity
published: "2025-06-11T06:22:02+00:00"
modified: "2026-07-15T10:51:27+00:00"
language: en-US
description: "Una Testnet (short for “test network”) is a parallel and public blockchain network that emulate the behavior of a mainnet, but where the tokens used have no economic value."
section: "Home > Testnet"
---

# Testnet

GLOSSARY · BLOCKCHAIN & WEB3

A testnet mirrors the consensus, gas and blocks of the live network with worthless tokens: it is where contracts, wallets and dApps are tried before mainnet.

WHAT IS IT? · FOR DUMMIES

A **testnet** is like a training ground for programmers who work with blockchain. It is used to test how an application, contract or transaction works **without spending real money**. Instead of using the main network (mainnet), you use a copy where the tokens have no value, so you can make a mistake without serious consequences.

WHAT IS IT? · PRO

A **Testnet** (short for “test network”) is a parallel and public blockchain network that **emulate the behavior of a mainnet**, but where the tokens used have no economic value. These networks are specifically designed to allow for the development, **testing and debugging of smart contracts, decentralized applications (dApps), wallets and Web3 tools** without financial risks. Testnets reproduce the logic of consensus, block validation, gas consumption, execution of transactions and network events, but with modified parameters that allow obtaining free tokens from “faucets” and operating at no cost.

Each major blockchain network usually has one or more testnets: Ethereum has **Sepolia**, **Holesky** (formerly Goerli), Arbitrum has **Arbitrum Sepolia**, Polygon has **Mumbai**, among others. These testnets also allow you to simulate forks, network updates, protocol changes and experience new functionality before their final implementation in production.

On a technical level, launching a dApp on testnet involves deploying contracts in a secure environment, verifying that the logic works as expected, testing integrations with oracles, UIs and wallets, and auditing behavior in multiple scenarios. It is also a mandatory step prior to deployment on mainnet within professional environments and certification or legal compliance processes (for example, in regulated tokenizations). In short, testnets are **infrastructure essential for quality, safety and efficiency** of blockchain development.

## 01 / Key points

- It's a test network that simulates a real blockchain
- Tokens have no economic value
- Allows you to test smart contracts and dApps without risk
- Faucets are used to get free test tokens
- It is a step prior to the launch on mainnet.

## 02 / Advantages

- **No real financial exposure** when experimenting, testing and debugging
- **Safe environment for testing**, simulating real behavior
- **Facilitates collaborative development**, even in complex projects
- **Ideal for pre-production technical audits**
- **Allows you to validate new ideas or integrations** before investing real resources

## 03 / Disadvantages

- **It doesn't always reflect real economic behavior** (ex: congestion, gas prices)
- **Worthless tokens can facilitate bad practices in malicious testing**
- **Less stable or restartable networks**: may suffer from resets or lack of nodes
- **Incompatibilities between testnets and mainnets** If there are differences in network configuration
- **They rely on faucets, which sometimes become saturated or don't work properly**

RELATED CONCEPTS

[Mainnet](/en/glosario/mainnet) [Smart contract](/en/glosario/smart-contract) [Gas](/en/glosario/gas) [Token](/en/glosario/token) [Ethereum](/en/glosario/ethereum)

KEEP LEARNING

[Smart Contracts without surprises: common mistakes in Solidity and how to avoid them](/en/articulos/smart-contracts-soliditys-errores-comunes-y-como-evitarlos) [Smart contracts: good practices that will save you from a hack](/en/articulos/contratos-inteligentes-bien-hechos-buenas-practicas-que-te-salvaran-de-un-hack) [How to raise investment for your blockchain project: Real and effective strategies](/en/articulos/como-levantar-inversion-para-tu-proyecto-blockchain-sin-vender-humo) [Comparison of smart contracts programming languages](/en/articulos/lenguajes-programacion-smart-contracts) [How to find the Product-Market Fit on Web3 (without burning your budget)](/en/articulos/como-encontrar-el-product-market-fit-en-web3-sin-quemar-tu-presupuesto)

RELATED SERVICES

[Web3 Development](/en/servicios/desarrollo-web3) [Development of smart contracts](/en/servicios/company-development-smart-contracts) [Smart contract auditing](/en/servicios/blockchain-security-audits) [Development for Ethereum (EVM)](/en/servicios/desarrollo-para-ethereum-evm) [White label tokenization platform](/en/servicios/plataforma-tokenizacion-marca-blanca)

[Full glossary](/en/glosario)

This entry is informative. It is not legal, tax or investment advice. The rules cited change: check the current version on [BOE](https://www.boe.es) and [EUR-Lex](https://eur-lex.europa.eu).