what does v for do code example

Example 1: vue for loop

<ul id="v-for-object" class="demo">
  <li v-for="value in object">
    {{ value }} 
  </li>
</ul>

Example 2: v-for only getting one first value vuejs

<option v-for="(location, index) in locations" v-bind:value="location.id" v-bind:selected="index === 0">
  {{ location.from }} - {{ location.to }}
</option>