What are glottalized consonants in Quechumaran and Chibchan languages?

In the context of South American Indian languages, glottalized consonants—specifically glottalized voiceless stops—are sounds produced with a simultaneous closure of the glottis without the vibration of the vocal cords.1

This process, known as glottalization, involves a momentary check on the airstream by closing the space between the vocal cords. In Quechumaran and Chibchan languages, these sounds are considered rather common. While these languages frequently utilize glottalized voiceless stops, they generally do not feature glottalized voiced stops, in which the vocal cords vibrate during the articulation.21