Difference between Title Template and SEO Title?

Hi,
Just created a website in wordpress and am using Yoast SEO Plugin. Have a little confusion. I have added the Title and Meta Description in all the Pages using the edit snippet. These Title and Description are based on Keywords which will help the page to show up in search results.

Then I came across this in SEO=>Search Appearance=>Content Types in which there is “Title Template” and “Meta Description Template”. What is the purpose of this field? Should I leave it empty as I have already added Title and Desc in All Pages