Today I learned that the essential difference between a Juice and a Smoothie is the way it’s produced. While juice is produced by extracting the liquid from the fruit, leaving behind dried pulp. A smoothie intentionally leaves the entire fruit together but cuts it small enough to so it no longer bothers your teeth when “drinking” it. A noted difference is that while juice usually results in almost pure liquid, smoothies often require some additional water to make them easier to drink.
I came across this while talking about juices today, facing the question if what they made was actually juice or a smoothie. To figure this out I watched some statements on YouTube as well as checking the definitions on Wikipedia