Crypto tokens are programmable assets built on existing blockchains, such as Ethereum and Solana. They represent units of value and can be used for various purposes, including representing money, digital assets, and even electricity. Tokens facilitate the execution of smart contracts, which are digital agreements that execute automatically when certain conditions are met. There are different types of tokens, including utility tokens, which provide access to a product or service, and non-fungible tokens (NFTs), which represent unique assets like digital art or collectibles. Tokens can also be broken down and categorized based on their structure and use cases.