What is submitting data through forms

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hey i just have some questions about the form section of lesson one of html
what exactly dot hey mean by submitting data to a server. like can you give an exampler of a website doing that so i can get a better understanding of what i can use this for?

Your code so far

<p>Click here to view more <a href="#">cat photos</a>.</p>

<a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>

<p>Things cats love:</p>
  <li>cat nip</li>
  <li>laser pointers</li>
<p>Top 3 things cats hate:</p>
  <li>flea treatment</li>
  <li>other cats</li>
<input type="text" placeholder="cat photo URL">

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.129 Safari/537.36.

Challenge: Create a Form Element

Link to the challenge:

When logging in to Free Code Camp, you entered your e-mail/password in a form which is then submitted to a server for processing before you could log in.

Basically a server is where the info of your form(or webpage) is submitted to be stored. I think it is an advanced topic that you will get to as you advance on the certification. I hope It helps you understand. Keep it up .

You can read a bit more in this MDN article.