difference between Varchar and nvarchar and char

 Varchar:-

1. It is a variable that has a length data type.
2. It is use to store non-Unicode characters.
3. It Occupy 1 byte of space for each character.

Nvarchar:- 

1. It is a variable that has length data type.
2. It is use to store Unicode characters.
3. It Occupy 2 bytes of space for each character.

Char:-

• It is a fixed length data type
• Used to store non-Unicode characters
• Occupiers 1 byte of space for each character