What is the difference between serendipity and synchronicity?

I’ve often been asked, "What is the difference between serendipity and synchronicity? In my post, What is synchronicity? I share that synchronicity is meaningful coincidence.  It’s a series of events which seem related but have no visible connection. Synchronicity has power and can be used as guidance, which I reveal in my new book, “Lifesigns: Tapping the Power of Synchronicity, Serendipity and Miracles.”