If you're using Jiglu for a private site, such as for your organisation's team collaboration, then you may not want any of the publicly visible pages to be able to be indexed by search engines such as Google or Bing. Private pages will never be visible to search engines, but you may also want to prevent search engines indexing the landing page.
To do this, go to the system settings, choose the Page elements category and change the Robots meta tag setting to ‘noindex, nofollow’. If you later change your mind then just change this to empty again.
There are other values you can use here - see here for a full list.