The part of the church where the priest's vestments are stored.

The part of the church where the priest celebrates mass

The part of the church where the people gather before mass

Where the mass readings occur

Where the sacrament of baptism occur

where the sacrament of Reconciliation occurs in a church

Where the consecrated hosts are kept in the church

Where the sacred chrism is kept (chrism is the oil used in the sacrament of Confirmation)

A cathedral, is named for the "cathedra". The cathedra is:

This structure is sometimes found in cathedrals. Walking through it symbolizes traveling on a pilgrimage. It's also used as a way to focus while you pray or meditate.

These are side rooms that people use for personal prayer when at the cathedral.