What is the purpose of indexes in database management systems?

Indexes in database management systems (DBMS) are used to speed up search and data retrieval. They work like pointers to table rows, allowing quick access to records without scanning all data.

Main advantages of indexes:

• Accelerating SELECT operations by quick access to needed rows.
• Improving the efficiency of sorting and grouping.

However, indexes occupy additional space and slow down insert, update, and delete operations, as the index also needs to be updated.

Example: if a users table has an index on the email field, searching for a user by email will be significantly faster than without an index.