Uh, sure. Stop bowing please.
Four principle forms of love (according to Helenestic culture)
In no particular order:
-Storge (Affection). This was reserved for family, primarily. Like the sort of love a father or mother has for their children or between paternal brothers/sisters.
-Philia (friendship). Yes, this is actually the root suffix we have for the "philias" we have today (pedophilia, necrophilia, etc), but its original meaning is more akin to those of a personal, non-family friend.
-Eros (passion). When we think of the typical romantic sort of love, it's Eros. Hell, the Greeks even had a goddess of the same name. It's commonly used to denote "natural love" via attraction or sometimes to describe compulsion (like when Eros plays cupid to mess with people).
-Agape. This is the most nebulous Greek definition of love, and is possibly the one that refers to "unconditional love". It's occasionally cited in biblical texts, but the definitions (in context) tend to overlap. Agape is the most personal and misunderstood love, sometimes referred to as "true love", or "love that cannot be explained".