One template can be applied to many pages and will share the same content in the editable areas you find in the top, left, right, bottom columns and areas. If you edit the shared content it will be updated on all the pages that share that same template.
If you would like to have different content in the editable areas on different pages you can create a copy of the template or duplicate template.

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Apply this template to all sub-pages as well - will apply this template to all the child pages.
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You will see a little picture on that page which signifies that the page is using a specified template other than the default template.
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