Query tuning is the process of optimizing database queries to improve their performance and efficiency. This involves analyzing how queries are executed and making adjustments to reduce execution time, resource usage, and overall load on the database. Techniques may include rewriting queries, adding indexes, or changing database configurations. Effective query tuning can lead to faster data retrieval and a better user experience. It is essential for maintaining the performance of database management systems like MySQL, PostgreSQL, or Oracle. Regular tuning helps ensure that applications run smoothly, especially as data volume and complexity grow.