HTML5 video tags

Trying to figure out why there needs to be 3 video formats declaired when using the html5 video tag? can someone explain this to me please?

You are not forced to use three (or multiple) formats. But a site may offer a number of alternatives to choose from in case a device does not support a certain codec.

Its to give broader browsers support as not all browsers support the same format. You can read more about it here.

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