Juniper berries are 'berries' from any of several species of Juniper. Junipers are conifers.
The berries are not really berries at all - they actually seed cones. They have unusually fleshy scales which are merged so that they look like a berry.
They are usually edible but can be very bitter on some species, a few species are toxic but not sufficiently so to pose a great risk to health in most people.
Juniper berries are the little blue fruits produced by species of Juniperus.
To my knowledge, they are not edible.
I guess I'm wrong about them not being edible!