I have to say, I have to pause and think to answer well. Once someone said brightly “Tell me about your horse!” and I said “Well, he’s a sixteen-one-hand chestnut TB gelding,” and she said “I didn’t understand a word you just said.”
Avoiding the jargon and relating everything to something they know or do is the best way.
It’s interesting to me that more people nowadays that live in the city appear to have no experience or concept of countryside or large animals. They have literally never even seen a horse in person, just photos. Or any other farm animal - the grocery store is the closest they’ve ever come. It can be challenging to translate.
When I have taken my horse to a state park with an equestrian trail on a weekend, it isn’t unusual to have grown-ups eagerly asking me if they and their children can pet my horse, because they have never petted a horse before. It’s sweet that it is a big event for them and they are excited just to stand there stroking him for a few moments. I have to coach them where to reach first and tell them what movements he will make, and that he is not unhappy or alarmed if he looks away, it is just what horses do. Fortunately my horse loves people and shows a polite interest in them, pricks his ears and stays still for petting - that really makes their day.