How are combos used????

Hi all!

How are combos used??
Do you guys throw multiple shots hoping some will reach their target (hook, cross, hook)or do you set them up (jab, cross to make the guy's hands stay up and digging deep with a left hook to the body) Everything go so fast when you fight or both ways, or else.....How do you guys use your combos???? THANKS

i am not a great striker by any means. but i can tell you this, get down a good 1 2 and a 1 2 3 and practice the hell out of it. after of course you have a good jab. then you should be in decent shape after the punches flow without much thought and then you should land acouple against most people. (execpt maybe above average mailmen)