Well, I mean, I understand an interval is the distance between two notes, but in practical application some of them can be played like a little two note chord. And they're a great way to add color to a melody/composition. Pardon my enthusiasm, this stuff is new to me. If you have any insight or ideas you'd like to share about intervals, please feel free to do so. Here is the video I was watching when the lightbulb went off as I was applying the idea to some phrases while playing along.