why use box shadow css code example

Example 1: shadow css

Source:www.w3schools.com
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image shadow cssCSS By Ankur on May 1 2020 Donate
<!Doctype>
<html>
<head>
  <style>
    .img {
      width: 400px;
      height: 200px;
      border:2px solid #fff;
      background: url(img/tiger.png) no-repeat;
      box-shadow: 10px 10px 5px #ccc;
      -moz-box-shadow: 10px 10px 5px #ccc;
      -webkit-box-shadow: 10px 10px 5px #ccc;
      -khtml-box-shadow: 10px 10px 5px #ccc;
    }
  </style>
</head>
<body>
  <div class="img"></div>
</body>
</html>

Example 2: box-shadow

blockquote {
  padding: 20px;
  box-shadow: 
       inset 0 -3em 3em rgba(0,0,0,0.1), 
             0 0  0 2px rgb(255,255,255),
             0.3em 0.3em 1em rgba(0,0,0,0.3);
}