What is "Drive by Wire" technology
 

I have a 2002 Accord SE, we are thinking of trading in and getting an end of
season 2007-SE.
I noticed in the sales stuff, Drive by Wire technology. What is this? And is
it good?
Do the 2007's 2.4 4 cylinder engines perform better then the 02.

How are the 07's. still well made????

Thanks