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A “key” is a special string attribute you need to include when creating lists of elements.
Keys give the elements a stable identity.
Keys help React identify which items have changed, are added, or are removed.
This results in a much more efficient update of the user interface.
On this page of the site you can watch the video online ReactJS Tutorial - 18 - Lists and Keys with a duration of hours minute second in good quality, which was uploaded by the user Codevolution 10 December 2018, share the link with friends and acquaintances, this video has already been watched 394,734 times on youtube and it was liked by 4.4 thousand viewers. Enjoy your viewing!