Learn CSS Grid by Building a Magazine -- STEP 10 -- Why the "fab"

HTML-CSS
1

Hi,

Would someone please explain to me the meaning of all the fab-fa I have to add in the code? I look for an explanation online, but I only got editors and other things, but not a “why” explanation. Why do I need to do it? Look at this : class="fab fa-facebook-f" there are five more in the code below.

Thank you.

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Magazine</title>
    <link
      href="https://fonts.googleapis.com/css?family=Anton%7CBaskervville%7CRaleway&display=swap"
      rel="stylesheet"
    />
    <link
      rel="stylesheet"
      href="https://use.fontawesome.com/releases/v5.8.2/css/all.css"
    />
    <link rel="stylesheet" href="styles.css" />
  </head>
  <body>
    <main>
      <section class="heading">
        <header class="hero">
          <img
            src="https://cdn.freecodecamp.org/platform/universal/fcc_meta_1920X1080-indigo.png"
            alt="freecodecamp logo"
            loading="lazy"
            class="hero-img"
            width="400"
          />
          <h1 class="hero-title">OUR NEW CURRICULUM</h1>
          <p class="hero-subtitle">
            Our efforts to restructure our curriculum with a more project-based
            focus
          </p>
        </header>
        <div class="author">
          <p class="author-name">
            By
            <a href="https://freecodecamp.org" target="_blank" rel="noreferrer"
              >freeCodeCamp</a
            >
          </p>
          <p class="publish-date">March 7, 2019</p>
        </div>
        <div class="social-icons">
          <a href="https://www.facebook.com/freecodecamp/"><i class="fab fa-facebook-f"></i>
          </a>
          <a href="https://twitter.com/freecodecamp/"><i class="fab fa-twitter"></i>
          </a>
          <a href="https://instagram.com/freecodecamp"><i class="fab fa-instagram"></i>
          </a>
          <a href="https://www.linkedin.com/school/free-code-camp/"><i class="fab fa-linkedin-in"></i>
          </a>
          <a href="https://www.youtube.com/freecodecamp"><i class="fab fa-youtube"></i>
          </a>
        </div>
      </section>
    </main>
  </body>
</html>
2

Those classes are for adding the Font Awesome icons that are going to be used for those links.

3

Then, why do they call them “fab”? At first, I thought the “fab” meant facebook. Plus there are two "fa"s: “fab” and “fa”

4

I don’t know. I’m not that familiar with Font Awesome so I don’t know all of the logic for why they named their classes the way they did. All I can tell you is that that’s how Font Awesome works (at least for the version of FA being used in this course).