Which term describes the chords that conclude a phrase or section in music?

The term that describes the chords which conclude a phrase or section in music is cadence. A cadence functions like a musical punctuation mark, signaling the end of a musical thought or phrase by establishing a sense of resolution. There are different types of cadences, such as authentic, half, deceptive, and plagal cadences, each providing a unique way of concluding a musical idea.

In contrast, a phrase mark is a visual symbol indicating the end of a musical phrase, but it does not specifically refer to the chords used for that conclusion. An interlude is a separate musical passage or piece that interrupts the main flow of music rather than concluding a section. Climax in music generally refers to the most intense or highest point of expression, rather than the closure of a phrase. Therefore, cadence is the accurate term for the chords that finalize a musical phrase or section.