content place holder in head section of the master page

I am wondering why there is a content place holder in the <head> section in the master page. What can I use this section for in the master page and in the page that consume this master page.
Thanks
TrialUserAsked:
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ComtekCommented:
You can put lots of stuff here. Anything that would normally go in the heading section of a typical web page. Probably one of the must common things is JavaScript code. Other items that could go in there are links to stylesheets and the page title.
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Jini JoseSenior .Net DeveloperCommented:
if you want to add a style or javascript, and that is only usefull in a particular page, then you can add that script to that pages content head section
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TrialUserAuthor Commented:
Ok, a follow up question, so in th master age when I do add a link to a style sheet, i need to put it inside the Content place holder like this or outside:

<head runat="server">
    <title></title>
   
    <asp:ContentPlaceHolder ID="head" runat="server">
    <link href="~/Styles/Main.css" rel="stylesheet" type="text/css" />
    </asp:ContentPlaceHolder>
</head>
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ComtekCommented:
Not exactly. When adding a link to a stylesheet in the master page, do it like this:
<head runat="server">
    <title></title>
    <link href="~/Styles/Main.css" rel="stylesheet" type="text/css" />
    <asp:ContentPlaceHolder ID="head" runat="server"></asp:ContentPlaceHolder>
</head>

When adding a link to a stylesheet in a child page, do it like this:
<asp:Content ID="head" ContentPlaceHolderID="head" runat="server">
    <link href="~/Styles/Main.css" rel="stylesheet" type="text/css" />
</asp:Content>

So when you are adding the stylesheet to the master page, put it outside the <asp:Content ..> tag. When adding it to a child page, put it within the <asp:Content ...> tag.
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ComtekCommented:
Just as a side note, once you add the style sheet to the master page, you do not need to add it to any child pages.

The only time you would add a style sheet to a child page is if you want that specific page to have a different style sheet than all the other pages on your site.
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TrialUserAuthor Commented:
Thanks a ton for your timely, detailed explanation
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