Is a mutual driveway an easement?

I have a mutual driveway that I share with my neighbour. IS this considered an easement or are easements something different?

Yes it is. However just because you share a driveway doesn't mean that there's an official easement. Check your survey plan and title documentation. Hint: look at the legal description of your property. If you see the "S/T and T/W in it, it means that your property is subject to the rights and obligations of easements.