* % (percent sign): This symbol represents zero or more characters.
* _ (underscore): This symbol represents a single character.
Example:
* `SELECT * FROM customers WHERE name LIKE '%Smith%';` - This query will select all customers whose name contains "Smith".
* `SELECT * FROM customers WHERE name LIKE 'J_hn';` - This query will select all customers whose name starts with "J" and has four letters, the third letter being any character.
These wildcard symbols are widely used in database query languages like SQL, but the specific implementation might differ slightly depending on the database system.