Divination is a means of communicating with someone or something you can’t see. You may specify who it is you wish to communicate with, and indeed, that is encouraged, because it leads to a clearer message and it keeps the non-corporeal riff-raff from horning in on the conversation. You can communicate with dead relatives, angels, saints, spirit guides, Deity (or Deities, if you’re a polytheist), Buddha, the Tao, or your own Higher Self or sub-conscious mind.
Divination is a picture of how things look, at this point in time. It could be different four or five hours from now, or it could look the same, and look different tomorrow. Because the future is being created with every decision we and others make, the future is constantly being tweaked and changed. This is why using divination to determine how the future will look is oftentimes a futile pursuit. The future can be nimble and light on its feet, like a dancer or a prizefighter. But the future can also be like an elephant; more solid and anchored to earth, and divination can prevent us from running right smack into it.
Divination is a morally-neutral pursuit. Like money or magic, divination is neither good nor evil in and of itself. It is your intent, and what you use it for, and the emotional energy you bring to it, which determines whether it is good or evil. Many people are uncomfortable with the idea of anything being morally-neutral, but such middle grounds do exist in life, and divination is one. If you pursue the morally-neutral practice of divination, make sure your motives are pure and your scruples are in order. Some divination methods will politely but pointedly refuse to deal with you if they aren’t.
Divination is a sacred practice. In many societies which practice divination, it is considered the proper preserve of the priesthood or shamans in that society, because it involves communicating with a Higher Power than oneself. To communicate with a Higher Power than oneself is the right of every human being, but do approach this conversation with seriousness, respect and an appreciation for the sacredness of what you are doing. I’ve also find from personal experience that divination does not tolerate disrespect. If you do not take it seriously, it will not take you seriously, and you will get no answer that makes any sense.