Under what circumstances are they called chords?

First of all, a chord refers to a group of sounds with a certain interval relationship. Traditionally, it generally refers to the longitudinal combination of three or more sounds with different pitches. In traditional western music, chords are all formed by the principle of three-degree superposition, that is, in a chord composed of three tones, two adjacent tones have a three-degree relationship. But now, as long as several sounds are stacked vertically and sound at the same time, they can be called chords.

Based on this judgment, if the notes in a bar are not arranged according to certain rules, such as the three-dimensional relationship, it is not a chord. Give two examples: (1)CEGB,(2)CEFD. Obviously, the first one is a chord and the second one is not.

there are two kinds of chords. One is that the sounds that make up a chord are voiced in turn, which is called broken chord, which is commonly known as arpeggio. One is that all the sounds that make up a chord sound at the same time, which is called harmony.

if you say arpeggio, the landlord should be familiar with it.