Percent character (Wildcard - Character(s) to Match) (Transact-SQL)
Matches any string of zero or more characters. This wildcard character can be used as either a prefix or a suffix.
Examples
The following example returns all the first names of people in the Person table of AdventureWorks2012 that start with Dan.
USE AdventureWorks2012;
GO
SELECT FirstName, LastName
FROM Person.Person
WHERE FirstName LIKE 'Dan%';
GO