ERC-20 tokens are a type of digital asset created on the Ethereum blockchain. They follow a specific set of rules, known as the ERC-20 standard, which ensures that all tokens can interact seamlessly with each other and with various applications. This standardization makes it easier for developers to create and manage tokens, as well as for users to trade and use them. These tokens can represent various assets, such as currencies, utility tokens, or even digital collectibles. Because they are built on the Ethereum platform, they benefit from its security and widespread adoption, making them popular for fundraising through Initial Coin Offerings (ICOs) and other blockchain projects.