Android : what is parent and view in onItemClick?

I have a difficulty in understanding following method. In the documentation, the method description is as follows:

public abstract void onItemClick (AdapterView<?> parent, View view, int position, long id)


Parameters:
parent      The AdapterView where the click happened.
view        The view within the AdapterView that was clicked (this will be a view provided by the adapter)
position     The position of the view in the adapter.
id           The row id of the item that was clicked.

I understand last two, but couldn't understand what parent does here and why view is required?

if someone have a good explanation, then please let me understand.