I think Jetpack is a great Plug-in. It has 37 settings that we can really utilize that will help our site. I use it on both of my websites. Plus it helps us with not downloading so many plug-ins. So if you have plug-ins that are in your Jetpack setting you can delete the others.
The other Settings that I didn't mention in the Settings are: Centralized Mangement (1), Develoers (3), Mobile (1), Other (5), Photos & Videos (5), Site Stats (1), Social (9), Traffic (1), and Writing (8). The #'s represent how many Settings are available for each.
Jetpack Settings are honestly a little complicated. So my advice is to go through each setting individually, always check the setting, then click configure or deactivate. If you ever want to deactivate the plug-in, follow the same steps.
JUST REMEMBER TO READ ALL REVIEWS FOR ALL PLUG-INS! READ EVERYTHING ANYWAY ABOUT 3 OR 4 TIMES BEFORE YOU DOWNLOAD IT TO YOUR SITE.
Hey, guys I noticed that some of you posted that Jetpack is not a good Plug-in, so to reassure you about Jetpack; before you download always look at the reviews. Jetpack has been downloaded and used by over more than 1,000,000 people. I'm adding screenshots of Reviews of Real people that has downloaded this Plug-in.