Understanding Get and Set Accessors

[L-Sama]

I'm a newbie and I'm trying to learn the basics of C#. This might sound quite trivial and may be stupid but its a doubt. While going through one of the source codes of an application, I saw a piece of code inside a class\[code\]private string fname;public string FirstName{ get { return fname } set { fname = value; }}\[/code\]Can anyone tell me what it means. I understand that when we declare a class we access \[code\]fname\[/code\] using an alias \[code\]FirstName\[/code\]. If it's for some security purpose then what?