diifernce betwwen surrogate key and primary key

[surinder]

Could anyone pls let me know the exactly the diff between surrogate key and primary key.where we can use that in practical live usage.pls help me dears................

Thanks and Regards
surinder

[UseCog]

please read the following,

http://en.wikipedia.org/wiki/Primary_key
http://en.wikipedia.org/wiki/Surrogate_key


Rgs,
UC