A smart device is anything that has enough computer intelligence and communications built-in so that when asked it can perform its natural service for a human or other smart device.  A smart door will unlock or open, a smart car will start its engine, a smart TV will turn-on or change channel, a smart cash register will charge your purchase, a smart toll gate will debit your card as you speed by...

An ItsMe-thing is any smarter device that knows how to operate within the Itsme System Architecture.  Within a decade that will be just about everything.  An Itsme-thing has sufficient computer intelligence and is networked to it's owner's Itsme-website so that it can check permissions for an Itsme-mobile, and transact business between the mobile and website.