First, let's start with the dictionary definition of polyamory: the practice of engaging in multiple romantic (and typically sexual) relationships, with the consent of all the people involved.

Here's a reasonably well thought out article on Polyamory from Psychology Today: https://www.psychologytoday.com/us/basics/polyamory

I've been polyamorous since 1999, have been legally married twice during that time, raised four kids in a polyamorous household. Let's chat!