What is the meaning of path in C#WPF Binding?

<x:name= "txt1"/><x:name= "Txt2 "  Text="{Binding path=text, elementname=txt1}"

The binding is a TextBox ( control type ) control named Txt1, but the TextBlock to display is of course not the type of control, so you need an indicator to specify what to display again,path is useful, and here it says The text value of the TextBox type control, that is, the value displayed in Txt1. 

"  {Binding path=text, elementname=txt1}"   Indicates the value of text in the TXT1.

<  x:name = "txt2" Text = "{Binding path=text, ELEMENTNAME=TXT1}"

If Txt1. Text is "This is Txt1", txt2 because its text bound Txt1.text property, so Txt2.text is also shown "This is Txt1", and if txt1. The value of text changes,txt2. The value of text also changes. 

What does the path in the C#WPF Binding mean