What is snippets in the editor

Hey Reader,
I am was writing an article when I found about a feature known as snippets, And i am not aware of what it is, if you can help me regarding it and what things I have to make snippets. And does that help in Seo?
My Website’s URL: https://www.nerdclump.com
What version of Ghost are you using? : latest Version
Can someone explain to me everything about snippets :man:t3:

Nerd Clump

It has no bearing on SEO, it’s a way to speed up using content that is repeated on multiple posts, or creating post templates that you can use to set up a typical post contents structure.