Do I need a key to use the Google Maps API?

Question

I connect script with API:

<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false"></script>

But in the documentation they write that you need to get the application key or can you do without it?

"write in the documentation" - and then what do you want from "here"?
Yes, you need a key, without it you will not launch your card) It is easy and simple to get the key) You just acc and create a project there, they will give you a key)
<script type="text/javascript" src="https://maps.googleapis.com/maps/api/js"></script>
if you find an error in the implementation of api , which will allow you to use api without specifying a key, then by exploiting it, you can omit the key.

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