Executing a store proc from ssms query window

When executing a store procedure  from ssms query window, what is the difference between

the command
exec [store procedure name] parameter1

or just

 [store procedure name] parameter1
Lawrence AverySystem DeveloperAsked:
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Nakul VachhrajaniTechnical Architect, Capgemini IndiaCommented:
No difference. The "EXEC" is implicitly added by SQL Server if missing. However, the recommendation is to use EXEC sp_executesql instead of just EXEC for parameterization support and possible protection against SQL injection.
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Microsoft SQL Server 2008

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