Replace function

Question

Hi everyone,

I had a doubt in replace function in SQL.

 

In our C# code we are passing 2 values like OCRTYZ-DYZ and D007654 by using concation separting with semicolumn

 OCRTYZ-DYZ;D007654

 

In the Sql script we have written the below replace function to replace the ; to , 

set @val = ''''+replace (@value,';',''',''')+''''

The above all are single quotes. Can anyone please explain what does the above line tells. 

 

 I understood ; is replaced with , but why those single quotes after that , also.

 

Thanks