Difference between varchar2 and nvarchar2

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In Oracle, there are two types of data that I can use to represent texts, the varchar2 and the nvarchar2.

What is the difference between these two types of data?

database oracle

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nvarchar2 stores the characters as Unicode and the Encode must be AL16UTF16 or UTF8.

varchar2 stores characters according to other encodings other than those provided by nvarchar2.

nvarchar2

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