How can I see the package name of the app that is installed on my phone?

How can I see the package name of the app that is installed on my phone?

There are many pre-installed apps on my Note II. Some are Google apps,
some are Samsung apps. Other apps, I don't actually know. I was hoping I
could fulfill my curiosity by checking the package name to see if it
starts with one of com.samsung. or com.google. or android.? Unfortunately,
I can only seem to find the display name which could be something as
simple as Clock or Camera or Email.
So, what's one of the easier ways to see the package name of a specific
installed or running Android app? I am on Android 4.1.2.