.uk Difference b/w ccTLD and gTLD ?

ccTLD - Country Code Top Level Domain
[ame]http://en.wikipedia.org/wiki/Cctld[/ame]
gTLD - Generic Top Level Domain
[ame]http://en.wikipedia.org/wiki/GTLD[/ame]

Can you please elaborate this "gTLD - Generic Top Level Domain".
what is the main difference between these 2.

I got some information..
The gTLD consists of the com, info, net, and org domains. In addition, the domains biz, name, and pro are also considered as generic.:hehe:

gTLD is generic top level domain
It can be .com, .net , .org

ccTLD is country code top level domain
it can be .us .uk .il