Well, its easy. You're first option doesn't start off with a capital i, while you're 2nd option does have that capital i. ----------- nah, no kidding. I think the question was spelled wrong. I think...
The internet ? An internet? To be exact in the answer. There is no difference. However, in grammar we use 'an' if a noun begins with a vowel sound. And If a common or collective noun is singular than...