Brackets, specifically square brackets [], are used in programming to denote arrays or lists. An array is a collection of elements organized in a specific order, allowing you to store multiple items under a single identifier. In the context of cryptocurrencies, programming languages often use arrays to manage data structures like transaction records, addresses, or other relevant information. For example, a list of wallet addresses can be stored in an array for easy access and manipulation. Using brackets allows developers to reference specific elements within the array. For instance, if you have an array of transactions, you can access a specific transaction by its index, allowing for efficient data handling. Brackets also enable operations like filtering, sorting, and iterating through elements, which is essential for processing data in real-time applications such as trading platforms or blockchain explorers. Overall, brackets play a crucial role in structuring and managing data related to various functionalities in the crypto ecosystem.