When C# allows to set string as null then why nullable string is intro

you have asked specifically for string but it has introduced for all reference types, the pupose is simple

we are human beings we forgot to assign value to a reference type but try to fetch it anywhere in the program

when the memory is not allocated then how compilar will retrive data, so it simply gives the world famous error of

null reference.

Now you can make any reference type nullable , that you are telling compilar that yes being a developer i want it to be null sometimes, please don't throw error on me.