SEO stands for Search Engine Optimisation, and is what is used to help boost your rating in search results. SEO is incredibly important in attracting new visitors to your site, you'll show higher up in search engines allowing others to see your site and visit.
Where Can You Find SEO Settings?
When viewing Page Details, you will find SEO Settings underneath the "Page Template" field.
Editing Your Page's Metadata
SEO Settings fields will automatically be displayed on your page if you have a Page Template applied.
Within your SEO settings:-
Page Title - Label your page so that visitors know what it is
Meta Description - Describe your page so that visitors know what it is about. (When typing in the description field, it will show you a countdown of advised character length for this.)