Prostration
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Prostration is the gesture of placing one's body in a reverentially or submissively prone position. Typically prostration is distinguished from the lesser acts of bowing or kneeling by involving a part of the body above the knee, especially the hands, touching the ground.
Buddhist pilgrims prostrating at the Jokhang.
White-clad deacon candidates prostrate before the altar of the Cathedral of Our Lady of the Angels in Los Angeles during their ordination liturgy
Eastern Orthodox pilgrims making prostrations at Golgotha in the Church of the Holy Sepulchre, Jerusalem.
Kneeling
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Kneeling is a basic human position where one or both knees touch the ground. Kneeling is defined as “to position the body so that one or both knees rest on the floor,” according to Merriam-Webster. Kneeling when only composed of one knee, and not both, is called genuflection.
A boy in the courtyard of the Great Umayyed Mosque in Syria
Worshippers kneeling (sujud-style) to pray
Kneeling in prayer is traditional in Christianity
Before the funeral, several portable, individual kneelers, called prie-dieus, were placed for use around this casket.