Parameterized queries in SQL refer to a method of executing database queries that allows for the input of dynamic values at runtime.

This technique enhances security by preventing SQL injection attacks, as it separates the query logic from the user input.

When creating a parameterized query, placeholders are used in the SQL statement where the dynamic values will be inserted.

These placeholders are then bound to the actual values provided by the user, ensuring that the input is treated as data rather than executable code. By using parameterized queries, developers can protect their databases from malicious attacks that attempt to manipulate the SQL code through user input.

This approach also improves performance by allowing the database to cache query plans and reuse them for subsequent executions with different parameter values. Overall, parameterized queries are an essential tool in SQL development for maintaining data integrity, enhancing security, and optimizing performance.

By leveraging this technique, developers can create robust and reliable applications that interact with databases in a secure and efficient manner.