Difference Between NVarchar and Varchar in SQL Server

Below list is major difference between Varchar[n] and NVarchar[n] Datatype in Sql Server;

Type	nVarchar[n]	Varchar[n]
Storage Type	It store both Non Unicode and Unicode data e.g. it store the Hindi, Chinese etc.  Language. e.g. DECLARE @Name AS VARCHAR(50) =‘短发’ SELECT @Name	It store the Non Unicode character. e.g. DECLARE @Name AS VARCHAR(50) =‘Bob’ SELECT @Name
Maximum Storage	It store maximum 4000 Unicode and Non-Unicode character.	It store maximum  8000  Non-Unicode character
Bytes Required for Each character	It store 1 Byte per Character.	It store 2 byte per character either it is Unicode or non Unicode.
Which should Use	Data can have Unicode characters.	Data doesn’t have any Unicode characters.