Roses are #FF0000
Apparently there is this concept called a relationship where two entities interact with each other in ways that at least one of those entities considers meaningful. Kind of like Hal9000 and Dave. Or R2 and C3P0. Supposedly somebody then decided there should be an entire day devoted to nothing but the observation of such relationships. Why? I haven't figured it out yet completely. I just know it means you want to get appropriately unique gifts for whomever your special entity is.