Probably the original Origanum, this one is a perennial.
Quite woody stems and branches in comparison to Marjoram.
A good, strong peppery taste from the leaves, enhances anything you cook with an Italian, Mexican twist.
Medicinally Oregano is great, especially during winter as a cold and flu tea, easing the nagging cough and headaches.
The leaves of Oregano are also quite antiseptic which makes it useful generally in the home.