What is the use of Key?

A Key is an identifier for Widgets, Elements and SemanticsNodes. A new widget will only be used to update an existing element if its key is the same as the key of the current widget associated with the element. It keeps a reference to state and access the state at different times or maintains it while modifying the widget tree.

1. What is the use of ?Key
A is an identifier for Widgets, Elements
and SemanticsNodes. A new widget will
only be used to update an existing element
if its key is the same as the key of the
current widget associated with the
element.
It keeps a reference to state and access the
state at different times or maintains it
while modifying the widget tree.
Key

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