What is voiced stop?

Some articles on stop, voiced stop, voiced:

Xavante Language - Phonology - Consonants - Allophony
... ’ /ʔ/ is a glottal stop ... onset before an oral vowel, /b/ is pronounced as a plain voiced stop at the beginning of a phonological word, and as either or as a prenasalized voiced stop ... and optionally also as before the oral allophones of the other voiced obstruents, /d/ and /j/ or ...

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