what does # mean?

i saw the syntax -->   <a href="page.html#layer">

Thank you guys
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It means to go to the anchor with name "layer".

check out anchor name

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It is used to have links on the same page. So somewhere in the source of page.html is a
<a name="layer"></a>

And by clicking on the link "page.html#layer" you will have that exact place on the page in your browser, not just the top of that page.
If you want to create links within a page you can accomplish it by using <a href="page.html#layer">
A small example for you to make it understand better

<a href="page.html#book1">Go to book 1 section</a>   : When you click this link it will take you to a book 1 section on page even if its all the way on the bottom of the page
<a href="page.html#book2">Go to book 2 section</a>
<a href="page.html#book3">Go to book 3 section</a>

<a name="book1">Book 1 section</a>
<a name="book2">Book 1 section</a>
<a name="book3">Book 1 section</a>
It is also used sometimes to create a "dummy" link for scripting purposes, e.g.

<p><a href="#" onclick="alert("Hi there!");">Click here for a useless message</a>.</p>

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assuming Zonstar ;) forgot to return false on an accident

<p><a href="#" onclick="alert("Hi there!");return false;">Click here for a useless message</a>.</p>

and used double quota's in a single quotas place

<p><a href="#" onclick="alert('Hi there!');return false;">Click here for a useless message</a>.</p>
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