Final answer:
Catholic churches celebrate Holy Thursday with the Eucharist, remembering Jesus's sacrifice as depicted in John's Gospel, with traditions including foot washing and referencing the Communion of the Apostles and Last Supper.
Step-by-step explanation:
Today, many Catholic churches commemorate Holy Thursday with a ritual called the Eucharist, as told in John's Gospel. During this celebration, also known as Holy Communion or The Lord's Supper, participants partake in eating bread and drinking wine in remembrance of Jesus's Last Supper with his disciples. This practice was initiated by Christ himself, and it symbolizes his sacrifice for humanity's sins.
The ritual of foot washing also takes place in some churches on Holy Thursday, imitating Jesus's act of humility before the Last Supper. This tradition, along with the Communion of the Apostles and the Last Supper imagery, helps congregants connect with the apostles' experiences, reinforcing the sacredness of the Eucharist in present-day worship.