Can someone explain blind stealing?

[Womble]

Hi, I have ventured into $1/2 at the crypto sites and noticed the play is much tighter than I am used to on some hands. When I am in late position I have tried raising my hands to try and steal the blinds. Sometimes it works and soetimes it doesnt

Question: I started doing this becuase I heard that people have used it on tight tables. I rarely fold if I am in the CO which is a leak [img]/images/graemlins/frown.gif[/img]. When you go for a blind steal, should you have some sort of hand or should you do it with junk? I lost most of my winnings in a short session becuase a blind steal backfired and lost to bottom pair [img]/images/graemlins/frown.gif[/img]