Final answer:
The FROM clause can contain an alias, a second name for a table that is used in complex queries.
Step-by-step explanation:
The FROM clause can contain a second, much simpler name for a table which is called an alias. An alias is useful when working with complex queries that involve multiple tables as it provides a way to refer to the table using a shorter, more convenient name. For example, if we have a table called 'students', we can assign it an alias 's' using the syntax 'FROM students AS s'.