What is difference between 1 phase transformer and 3 phase transformer?

1.Single-phase systems use a single, sine wave voltage while a three-phase system uses three.
2.A single-phase system uses two wires while a three-phase system uses three or four.
3.Three-phase systems are used mostly in industrial environments while single-phase systems are used in homes.
4.Three-phase systems are less costly for transferring power than single-phase systems.
5.A three-phase system performs better in motors than single-phase systems