"Al" is a definite article like "the" in english, der/die/das in german, le/la in french but unlike the other languages, there is only one form for it, whether for male or female it is used to specify a certain object, instead of being anonymous exactly as in the example of the car posted by gamell now here, "zain hamdullilah" doesn't really make a lot of sense to me. This word "hamdullilah" is normally associated with "Al" which is fairly logical because it would literally translate to "The Thanks to God" since you are specifying a certain situation or a blessing upon whom you thank God for..so 'The Thanks for this situation/blessing is to God'... But in any case, whichever way you say it, people will understand you it's just a matter of which is more correct :) Good Luck

In this case it does not make the much of a difference. The AL or the aliph lam in the beginning of a word just make the word definite. Its the difference between "THE" car and "A" or "ANY" car. EX. AL Seeyara would be "THE" car and just Seeyara by itself could many any car.

its like man and the man only dont make difference

الالف والام بين الحمد لله - حمد لله

They r same .. but, i prefer to say Alhamdulilleh, zain.