What are row constructors?

ROW Constructor or Table Value Constructor means to create a row set by using the VALUES() clause. This allows multiple rows of data to be specified in a single DML statement.

SELECT * 
FROM (
VALUES
    (1, 'cust 1', '(111) 111-1111', 'address 1'),
    (2, 'cust 2', '(222) 222-2222', 'address 2'),
    (3, 'cust 3', '(333) 333-3333', 'address 3'),
    (4, 'cust 4', '(444) 444-4444', 'address 4'),
    (5, 'cust 5', '(555) 555-5555', 'address 5')
) AS C (CustID, CustName, phone, addr);