Do I need Jetpack?
Jetpack is a plugin by Automattic, the development company behind Wordpress.com, Gravatar, WooCommerce, and many more.
More than just a plugin, it's like a suite of options you can add to your site, and some of them are paid.
For online stores, Jetpack can automatically taxes and print shipping labels, which is pretty cool.
However, they also will offer you other things you don't need... which is going to be a little confusing.
For example, they'll say "get automatic backups" or "get security on your website"... all these things are already included in your hosting.
I use Jetpack for it's automatic tax features and that's about it.