Edit in JSFiddle

$(document).ready(function () {
    $(document).on('click', '#hide', function (event) {
       $(".description").hide();
    });
     $(document).on('click', '#show', function (event) {
       $(".description").show();
    });
});

<div class="description">
jQuery is a fast, small, and feature-rich JavaScript library. It makes things like HTML document traversal and manipulation, event handling, animation, and Ajax much simpler with an easy-to-use API that works across a multitude of browsers.
</div>
 <input type="submit" value="Hide" id="hide" />
 <input type="submit" value="Show" id="show" />