HELLO FRNDS

                          I NEED AN URGENT HELP FROM U ACTUALLY I M SO MUCH CONFUSED BY DATUM,I HAVE LOT OF QUESTION ABOUT DATUM

Q1. WHAT IS DATUM IS IT JUST FOR REFRENCE ONLY?

Q2 DATUM IS LINKED TO PLANE,EDGE OR PROJECTION VIEW?

Q3HOW DO WE KNOW THIS IS A,B OR C

Q4 CAN SOLIDWORKS AUTOMATICLY USE THIS FEATURE I MEAN CAN SW AUTOSELECT A,B OR C