Is there a way to use Wildcards with a LIKE compare statement in SQL

I have a stored procedure where I'm searching a table for Customers Name. SO for example

I have a parameter   @LastName

Is there a way to use the LIKE function with some sort of WildCard?

Such as Select LastName from Customer where LastName LIKE @LastName+'%'

I know that doesn't work but I'm trying to figure out the best way to use soem sort of wildcard so if the user is searching for a customer with lastname of JONES, they can just enter JON and see all the customers whose lastnames begin with JON.

I'm calling this sp from an aspx web page I can probable do the wild card through aspx but if I can just do it through the SP that would be better.

Thanks