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SQL Server Encryption Symmetric vs. Asymmetric Keys

I need to encrypt my data within SQL Server and I plan on using the built-in encryption functionality in SQL Server 2005 and 2008. However, I'm looking at symmetric and asymmetric key algorithms and while I see information saying to use symmetric keys, I don't understand why. What's the difference between the two and why is a symmetric key algorithm preferred over the asymmetric key ones?

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Question of the Day

Converting Money

Does this run successfully on a SQL Server 2022, US English default installation?

DECLARE @YenAmount MONEY;
SET @YenAmount = ¥1500; 

SELECT @YenAmount AS RawValue;

See possible answers