This consonant is aspirated and less or no vibration of vocal cords
Barring a few exceptions, its is always aspirated (when s is preceeds p then /p/ is not aspirated)
/b/ is the voiced counterpart. It is also a stop plosive with a bilabial articulation.
This consonant has less or no aspiration and vocal cords are vibrated.
Barring a few exceptions, its is always voiced.