What do you mean by keys in flutter? When one should use it.

1.	What do you mean by keys in flutter? When one should use it.
Answer» Keys are used in Flutter as identifiers for widgets, elements, and semantic NODES. GlobalKeys and LocalKeys are the SUBCLASSES of Key. WITHIN the widget tree, keys are RESPONSIBLE for preserving the state of modified widgets. With keys, you can also reorganize and modify collections of widgets that have an equivalent type and defined state. The primary use of keys is to modify a widget tree that CONTAINS stateful widgets, not to modify a tree that is totally composed of stateless widgets.

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