Holy Saturday is the day after Good Friday. It is the day before Easter and the last day of Holy Week, in which Christians prepare for Easter. This day commemorates the day that Jesus Christ's body lay in the tomb.
In Roman Catholic Churches, the sanctuary remains stripped completely bare while the administration of the sacraments is severely limited. Holy Communion after the Good Friday service is given only as Viaticum to the dying. Baptism, Penance, and Anointing of the Sick may be administered because they, like Viaticum, are helpful to ensuring salvation for the dying. All Masses are severely limited. No Mass at all appears in the normal liturgy for this day, although Mass can be said on Good Friday and on Holy Saturday for an extremely grave or solemn situation with a dispensation from the Vatican or the local bishop. Many of the churches of the Anglican Communion as well as Lutheran, Methodist, and some other Churches observe most of the same; however, their altars may be covered in black instead of being stripped.
In Eastern Orthodoxy this day, known as Holy and Great Saturday, is also called The Great Sabbath since it is on this day that Christ "rested" physically in the tomb. But it is also believed that it was on this day he performed in spirit the Harrowing of Hades and raised up to Paradise those who had been held captive there. In the Coptic, Ethiopian and Eritrean Orthodox Churches, this day is known as Joyous Saturday. (From: Wikipedia, license: CCA-SA)