findBymethods in Entity beans

Hi experts
this is my findBy method() and create method in home interface of Entity bean :
public Collection findByName(String string) throws FinderException,RemoteException;
public com.sample.entitybean.SampleEntitybean create(java.lang.String productId,
      java.lang.String name,java.lang.Double productPx,java.lang.String description)
            throws javax.ejb.CreateException, java.rmi.RemoteException;

I know the create method instantiates the bean something like
Home.create(“10001”, “tomato soup”, new Double(2),”Bowl of soup”);
Iterator I = home.findByName(“juice”).iterator();
While(i.hasNext())
{
SampleEntitybean product =( SampleEntitybean)portableRemoteObject.narrow(i.next(),SampleEntitybean.class);
// SampleEntitybean is the remote interface
}

Questions
What exactly is difference between create() and findBymethods() in the home interface of an entity bean.
What operations can I do with findByName() method?
What is findByName() doing above and whats happening in the while loop?


Any ideas,

Thanks
J
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