<div id="footer">
<p><a href="link.html">Link</a>
<a href="link.html">Link</a></p>
</div>

Result: LinkLink

If I add a space in between <a href="link.html">Link and </a></p>

Result: Link Link

<div id="footer">
<p><a href="link.html">Link</a> &nbsp;
<a href="link.html">Link</a></p>
</div>
<!-- or -->
<a href="link.html">Link</a> <a href="link.html">Link</a></p>

both give Link Link
everything inside <a></a> is link,
if you want spaces that arent underlined and clickable add them outside the <a></a> tags,

&nbsp; = html 'hardspace' non-break space

or you can add margins & padding to your links in css