Change is a situational shift.
Getting a new boss is a change, and so is receiving a promotion or losing your job.
Moving to a different house is a change, and so it remodeling your house or losing it in a fire.
Having a new change is a change for everyone in the family—including the new baby, who was pretty well situated before all the change too place.
And, of course, losing a loved one is a change—a huge one
Transition, on the other hand, is the process of letting go of the way things used to be and then taking hold of the way they subsequently become. In between the letting go and the taking hold again, there is a chaotic but potentially creative “neutral zone” when things aren’t the old way, but aren’t really a new way yet either. This three-phase process—ending, neutral zone, beginning again—is transition.
William Bridges, The Way of Transition