The usage of this this.name=name what does this mean?

Public Employee (string name, string alias)
{
    Use the-qualify the fields, name and alias:
    THIS.name = name;
    This.alias = alias;
}

The usage of this this.name=name what does this mean? I'm a little hard to understand.

This is a constructor,this.name refers to the properties of the current class, and the latter name is a parameter in the constructor
This is to assign a value to a property in a class

The This keyword is used to refer to the  current object and cannot be assigned, but the value of the This keyword can be assigned to another variable.

The usage of this this.name=name what does this mean?