what is scrollspy in bootstrap code example

Example 1: Bootstrap 4 Scrollspy

<!-- The scrollable area -->
<body data-spy="scroll" data-target=".navbar" data-offset="50">

<!-- The navbar - The <a> elements are used to jump to a section in the scrollable area -->
<nav class="navbar navbar-expand-sm bg-dark navbar-dark fixed-top">
...
  <ul class="navbar-nav">
    <li><a href="#section1">Section 1</a></li>
    ...
</nav>

<!-- Section 1 -->
<div id="section1">
  <h1>Section 1</h1>
  <p>Try to scroll this page and look at the navigation bar while scrolling!</p>
</div>
...

</body>

Example 2: scrollspy bootstrap 4

<nav id="navbar-example2" class="navbar navbar-light bg-light">
  <a class="navbar-brand" href="#">Navbar</a>
  <ul class="nav nav-pills">
    <li class="nav-item">
      <a class="nav-link" href="#fat">@fat</a>
    </li>
    <li class="nav-item">
      <a class="nav-link" href="#mdo">@mdo</a>
    </li>
    <li class="nav-item dropdown">
      <a class="nav-link dropdown-toggle" data-toggle="dropdown" href="#" role="button" aria-haspopup="true" aria-expanded="false">Dropdown</a>
      <div class="dropdown-menu">
        <a class="dropdown-item" href="#one">one</a>
        <a class="dropdown-item" href="#two">two</a>
        <div role="separator" class="dropdown-divider"></div>
        <a class="dropdown-item" href="#three">three</a>
      </div>
    </li>
  </ul>
</nav>
<div data-spy="scroll" data-target="#navbar-example2" data-offset="0">
  <h4 id="fat">@fat</h4>
  <p>...</p>
  <h4 id="mdo">@mdo</h4>
  <p>...</p>
  <h4 id="one">one</h4>
  <p>...</p>
  <h4 id="two">two</h4>
  <p>...</p>
  <h4 id="three">three</h4>
  <p>...</p>
</div>

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