The Greeks classified love as having 4 kinds: Eros, Storge, Philia, & Agape
Eros is the flow of passion and desire, of sexual and sensual love. It is the flow between two lovers. Being more instinctual, it is driven more by the lower or instinctual brain in the Triune brain* model. Yet Plato defined it as the more detached love of Beauty.
Storge is the love between a parent and child. This is also described as Familial love or natural empathy. This is driven more from the mammalian brain that drives the limbic system, creating deep connections and attachments.
Philia is the love of friends and community. This is also called social or brotherly love, creating bonds with our larger world. That is a prime motivator for loyalty and altruism. In the more modern world, this may be less developed than in more traditional cultures. Yet it can be a key for emotional health. Similar to Storge, it is mammalian. The opposite of Philia is Phobia.
Agape is what we might call higher love. It is not limited by person but rather is the underlying flow of life itself. When Agape is present, it overflows and is unconditional. It gives without seeking return. It is unattached love. It is an open heart. It is the love we discover within that brings a deep meeting of any unaddressed needs. The Big Love.
*like the left-brain, right-brain model that took on a life of it’s own, the triune brain model is a generalization that can help understand the layers of the brain. But actual brain functioning is vastly more complex than this.