When you install Foundation through command line, Foundation plugins downloads as individual files such as foundation.tabs.js, foundation.dropdownMenu.js, foundation.slider.js and so on. All these files are combined into foundation.js, which provides all the plugins at one time. If you wish to use some plugin, first foundation.core.js should be loaded.
For instance −
<script src = "js/jquery.min.js"></script> <script src = "js/foundation.core.js"></script> <script src = "js/foundation.tabs.js"></script>
Loading individual files creates network overhead, specifically for mobile users. For faster page loading, use of grunt or gulp is recommended.