Email Digests are a great way to keep updated on the content you follow without being inundated with notifications. Instead, you can choose to receive one daily email summarizing all of the activity you normally get individual, instant notifications of. This includes replies to discussions you follow, comments on your posts or My Page and new friend requests.
Some emails, like broadcast messages and upload errors, will continue to reach members immediately and are not included in their email digests. Once you enable this feature on your network, each member can opt in to begin receiving digests for the content they follow and groups they belong to.