What does the symbol do in SQL

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I was browsing through the questions and noticed this:

SELECT prodid, issue
FROM Sales 
WHERE custid = @custid 
AND datesold = SELECT MAX(datesold) 
             FROM Sales s 
             WHERE s.prodid = Sales.prodid
                  AND s.issue = Sales.issue
                  AND s.custid = @custid

What is the purpose of the "@" before custID, I wondered? Is it merely a method of referencing the custID from the specified table?

Sep 8 in Database by Kithuzzz
• 12,240 points
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