The top link bar is also referred to as global navigation, because it can be the same across all of the sites in a site collection.

The top link bar helps users of your site navigate to other sites in the site collection by displaying a row of tabs at the top of pages in the site. The top link bar is also referred to as global navigation, because it can be the same across all of the sites in a site collection. However, subsites can be configured to not display in the top link bar of the parent site. The options available to you for configuring your top link bar will vary depending on whether the publishing features are enabled for your site collection.

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