Love has several different meanings in English, from something that gives a little pleasure ("I loved that meal") to something one would die for (patriotism, pairbonding). It can describe an intense feeling of affection, an emotion or an emotional state. In ordinary use, it usually refers to interpersonal love. Probably due to its psychological relevance, love is one of the most common themes in art.
Just as there are many types of lovers, there are many kinds of love. Love is inherent in all human cultures. It is precisely these cultural differences that make any universal definition of love difficult to establish. See the Sapir-Whorf hypothesis.
Expressions of love may include the love for a "soul" or mind, the love of laws and organizations, love for a body, love for nature, love of food, love of money, love for learning, love of power, love of fame, love for the respect of others, et cetera. Different people place varying degrees of importance on the kinds of love they receive. Love is essentially an abstract concept, easier to experience than to explain.
A person can be said to love a country, principle, or goal if they value it greatly and are deeply committed to it. Similarly, compassionate outreach and volunteer workers' 'love' of their cause may be borne not of interpersonal love, but impersonal love coupled with altruism and strong political convictions. People can also 'love' material objects, animals, or activities if they invest themselves in bonding their identity with that item. In some cases there may be an erotic component to such feeling of love. If that desire reaches the point of being acted out, it may be considered unhealthy, and fall under the category of paraphilia.
Religious love
Whether religious love can be expressed in similar terms to interpersonal love is a matter for philosophical debate. Religious 'love' might be considered a euphemistic term, more closely describing feelings of deference or acquiescence. Most religions use the term love to express the devotion the follower has to their deity, who may be a living guru or religious teacher. This love can be expressed by prayer, service, good deeds, and personal sacrifice. Reciprocally, the followers may believe that the deity loves the followers and all of creation. Some traditions encourage the development of passionate love in the believer for the deity. Refer to Religious Views below.
Biological models of love tend to see it as a mammalian drive, just like hunger or thirst. Psychology sees love as more of a social and cultural phenomenon. There are probably elements of truth in both views — certainly love is influenced by hormones (such as oxytocin) and pheromones, and how people think and behave in love is influenced by their conceptions of love.
Attraction and attachment
The conventional view in biology is that there are two major drives in love — sexual attraction and attachment. Attachment between adults is presumed to work on the same principles that lead an infant to become attached to its mother.
Companionate vs. passionate
The traditional psychological view sees love as being a combination of companionate love and passionate love. Passionate love is intense longing, and is often accompanied by physiological arousal (shortness of breath, rapid heart rate). Companionate love is affection and a feeling of intimacy not accompanied by physiological arousal.