In an HTML document, CSS Type Selectors match an element based on the element's node name (ex. the node name for <br /> is br and for <p> it's p). This is one of the most common selectors of all, due to its simplicity of understanding and since it is one of the first things you learn in CSS.
Example:
<html>
<head>
<title>Title</title>
<style type="text/css">
span {
text-decoration:underline;
}
br {
clear:both;
}
p {
text-indent:50px;
color:green;
}
</style>
</head>
<body>
<p>
<span>This is green underlined text with a 50px indent.</span>
</p>
<br />
This is not. It is only cleared from both sides.
</body>
</html>