Why Are Animals Symmetrical?

Animals range in size shape and biology drastically but there is one thing that unifies more than 95% of animals, and every known land animal. Something that almost all animals inherited from an incredibly ancient common ancestor hundreds of millions of years ago. they have a left and a right side which are mirror images of each other. So why is this and why has this made them so successful?

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Sources:
https://www.pnas.org/content/117/14/7845
https://web.archive.org/web/200709290...
https://evolution.berkeley.edu/evolib...
https://www.sinauer.com/media/wysiwyg...