whta is rtl and ltl in bootstrap code example

Example 1: bootstrap rtl

<!-- Load Bootstrap RTL theme from RawGit -->
<link rel="stylesheet" href="//cdn.rawgit.com/morteza/bootstrap-rtl/v3.3.4/dist/css/bootstrap-rtl.min.css">

Example 2: rtl bootstrap

<!-- CSS -->
<link rel="stylesheet" href="https://cdn.rtlcss.com/bootstrap/v4.5.3/css/bootstrap.min.css" integrity="sha384-JvExCACAZcHNJEc7156QaHXTnQL3hQBixvj5RV5buE7vgnNEzzskDtx9NQ4p6BJe" crossorigin="anonymous">

<!-- jQuery and JS bundle w/ Popper.js -->
<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script src="https://cdn.rtlcss.com/bootstrap/v4.5.3/js/bootstrap.bundle.min.js" integrity="sha384-40ix5a3dj6/qaC7tfz0Yr+p9fqWLzzAXiwxVLt9dw7UjQzGYw6rWRhFAnRapuQyK" crossorigin="anonymous"></script>