aria-labelledby and aria-hidden tags meaning

I am building a website using Bootstrap 3. I wanted to implement modals in my website. I made them with the help of the documentation.

Now, I have this code, which makes the modal window:

<div class="modal fade" tabindex="-1" id="myModal" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">

And this code for the modal title:

 <h4 class="modal-title" id="myModalLabel">Flexibilní mřížka</h4>

Of course there are several more rows of a code but what I would like to know the meaning of aria-labbeledby and aria-hidden attributes. I found some explanations but nothing in particular which would help me to understand.

Source: html5

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