SQL queries are commands used to communicate with a database. They allow users to retrieve, insert, update, or delete data stored in tables. For example, a simple query can ask the database to show all the records of customers from a specific city, making it easier to analyze information. Using SQL, you can also perform complex operations, like joining multiple tables to get a comprehensive view of related data. This is particularly useful for businesses that need to track sales, inventory, or customer interactions. Overall, SQL queries are essential tools for managing and understanding data in systems like MySQL or PostgreSQL.