Infinite Scrolling automatically loads more posts when the reader approaches the bottom of the page, rather than having to click a link to get to the next set of posts.
To enable this feature, go to: Jetpack Settings > Appearance and enable Infinite Scroll. It only has two options: one enabling Infinite Scroll, and one tracking each new scroll as a Google Analytic page load.
On the front end, visit your blog page, and scroll to the bottom. When you get to the bottom of the page, you should now see a loading icon while another set of posts load. This is a great feature that a lot of users appreciate if browsing through a lot of content.