What happens in Get Set Property while Binding in WPF ?

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C#

.NET

WPF

C#3.5

C#5.0

Hi,

I am new to WPF can anyone explain get set property regarding below questions and program,

1)why we are assigning private and public,
2)what is the use of get and set keyword,
3)what value we are returning in get,
4)why we are using "value",
5)what is the use of RaisePropertyChanged()
6)What is the link between xamal file and cs file by assigning Text="{Binding Path=FirstName}" in xamal file

public class Person
{
    public string FirstName { get; set; }
} 

public class MainViewModel : ViewModelBase
{
  private const string FirstNamePropertyName = "FirstName";
    public string FirstName
    {
        get
        {
            return _newPerson.FirstName;
        }
        set
        {
            _newPerson.FirstName = value;
            RaisePropertyChanged(FirstNamePropertyName);
        }
    }
}

Thanks in advance...
R.Karthik