Why the title of the poem \'A Photograph\' is A photograph... Why it is not \'the photograph\'

Why the title of the poem \'A Photograph\' is A photograph... Why it i

1.	Why the title of the poem \'A Photograph\' is A photograph... Why it is not \'the photograph\'
Answer» Because the poem is for all the photographs not for a particular photo May be because they talking about a single photograph.