When someone passes away, sometimes their loved ones hold a special event to remember them and say goodbye. This is called a memorial service.
In the Orthodox tradition, a memorial service happens in a church and is led by a priest. During the service, people might light candles, pray, and sing special songs.
The priest might also read from a special book called the Psalter, which has prayers and poems that are important in Orthodox worship.
At the end of the service, people might give donations to the church or charity in honor of the person who passed away.
It's a way to show love and respect for someone who was important to us, and to remember them even after they are gone.