doubt in design pattern

i am new to these design patterns.. can u able to explain breifly what are the uses while using these design pattern..

can u able to explain at which situation we using thes design patterns..

which pattern is more efficient among the Gof , enterprise and architectural pattern.....

i hope ur reply .... as soon ...

  mail adress: prasadb@broadline.co.in,prasadengg2006@gmail.com