What is this? public Node(object value) : this(value, null) { }

[comn8u]

What is this and how is it used?

If this was a class, I know the colon : means inheritence, but it is not in this case. What is this?

public Node(object value) : this(value, null) { }

[comn8u]

Well, I know now it is a constructor, but what does the : do in this scenerio?

class Node
{
public Node Next;
public object Value;
public Node(object value) : this(value, null) {}
public Node(object value, Node next) {
Next = next;
Value = value;
}
}