Common Table Expressions (CTEs), often called CTEs, are a powerful feature in SQL that allows you to define a temporary named result set within a single SQL statement. Think of them as intermediate steps in a larger query. Instead of embedding complex subqueries or repeating the same data retrieval logic multiple times, CTEs let you define a reusable result set that can be referenced multiple times within the same statement. This significantly improves the readability and maintainability of your SQL code, especially for intricate queries. CTEs are particularly useful when dealing with complex joins, aggregations, or recursive calculations. They make the query logic more modular and easier to follow, reducing the risk of errors and improving overall query performance. By breaking down a complex query into smaller, self-contained CTEs, you can better understand and debug the logic behind each step, leading to more robust and efficient SQL code. Essentially, CTEs act as a way to organize and reuse parts of your query, making it more organized and easier to understand.