Using @ as prefix in variable naming

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C#

.NET

Hi all,

I have question what does it mean using @ as prefix for a variable Name or in a method parameter name as like below. as you can see i have used same variable name with and without @ so what was the difference. Hope for you guys it will be a basic question which i don't know the difference.

public static string ReplaceSpecialCharacters(this string @sText)
        {
            @sText.Replace("& lt; ", "<");
            @sText.Replace("& gt;", ">");
            sText.Replace("& amp;", "&");
            @sText.Replace("& quot;", "\"");
            sText.Replace("& apos;", "\'");
            return @sText;
        }