A deprecated tag is one that is being phased out and at some future point will no longer work on new browsers. You are encouraged to avoid using deprecated tags. You should use either newer tags that...
<applet> <basefont /> <center> <dir> <isindex> <menu> <s> <strike> <xmp>
The transitional document type allows the used of deprecated tags.
</body>
Pair tag have a closing at the end eg: <b> text </b> Impair tag does not have closing