Whats the difference between blue ray DVDs and regular DVDs?

Hi ya apples99 I am completely lost when it comes to all this blueray business!! What I understand is that the picture quality is a lot better but you need a blueray dvd paly it on right? Who know's?

First i need to tell you that a blue ray disc cannot be played in a standard dvd player and a seprate blue ray player has to be bought in for that case which costs around $400 dollars at present and a blue ray disc capacity ranges from 50GB to 500GB according to the rate and they promise that it would be better than the standard DVD and its in built with the Hi-Definition picture so it would be great but the cost of the blu ray dvd starts from around $4 dollars to $40 dollars.. Happy Mylotting

I don't have a dvd player but my son does. I wonder if he prefers blue ray over the standard one. Cheers!!