Hello aspirant,
Three phase power distribution requires less copper or aluminium for transferring the same amount of power as compared to single phase power.The size of 3 phase motor is smaller than that of a single phase motor.

The voltage between two lines is called line voltage or line to line voltage.3 phase system is expressed with line voltages.The line voltage is 440 volts.Also the voltage between any one phase and neutral for a 3 phase system is 240 volts.
Hope you understood.
Thank you!!!!

Hello

A line to neutral voltage is the voltage measured between line conductor and a neutral(any point of zero potential) and it gives the exact voltage of the line.
For a three phase system, the line to line voltage is1.732(3) times the line to neutral voltage.

If you have any doubts please drop out in comment section

Thank you::)