Hegel's unity of form and content

I am perplexed as to what Hegel is talking about when he mentions both form and content. Am I to understand form as the external subjective apperance, and content as the ethical objective world in which the subject relates? Is the comparison of form and content to subject and object an accurate one?

I’m not sure about Hegel’s views on the matter, but I tend to look at the external outward appearance of things, what we call form, in terms of the truth. For this is the means by which we identify and label things, and determine their utility. For example, when we look at a horse, we know that it’s a horse because it looks like a horse and acts like a horse. And, while we may not know anything about the essence of a horse, about its internal workings or content, it doesn’t change the fact that it remains a horse. In other words we know at least this much.