Widgets exist to offer quick access to certain features in the apps we use most. On the Samsung Galaxy Note 4, home screen widgets let me do pretty much anything, from checking the forecast to browsing my emails.
Most new Android devices come with at least one feature that helps control navigation, music, and more through voice-controlled, hands-free communication. While they usually don't end up being completely "hands-free," these apps do stop people from using both hands to perform tasks on their smartphones while driving, therefore distracting them less overall.
With the gargantuan size of the Samsung Galaxy Note 4, it's no surprise that some of you might have trouble taking advantage of all the features using only one hand. One such feature is the newly-added fingerprint scanner, which allows you to swipe your finger on the Home button to unlock the device, among other things.