What is the difference between single and three phase power and difference between single phase and three phase motor?

single phase is line 1  &  line 2 w/220 volts ac...while 3 phase is line 1,2,3 - with 230/220volts ac   .......single phase motor will start by using a capacito,or capacitor start  motor...used for single phase ....while 3phase motor will start w/o capacitor .or will start it self by using of line 1,2,3 or 3 leads motor