This site has some pretty good explanations.
http://www.mypersonality.info/personality-types/
one of the sites that links to for INFJ:
http://www.personalitypage.com/INFJ.html
"INFJs are gentle, caring, complex and highly intuitive individuals. Artistic and creative, they live in a world of hidden meanings and possibilities. Only one percent of the population has an INFJ Personality Type, making it the most rare of all the types." (it's actually 0.5% for males)
So true for me. This part:
"INFJs have uncanny insight into people and situations. They get "feelings" about things and intuitively understand them. As an extreme example, some INFJs report experiences of a psychic nature, such as getting strong feelings about there being a problem with a loved one, and discovering later that they were in a car accident. This is the sort of thing that other types may scorn and scoff at, and the INFJ themself does not really understand their intuition at a level which can be verbalized."
happens A LOT to me....it gets kinda scary sometimes, especially when my dreams are part of it...
And sometimes, I can tell exactly what kind of a person someone is, what a lot of their interests are, how they think about things, and what many of the things they've been through are, before I actually talk with them. I don't actually try to think about that stuff (like how some people analyze how others look/act/talk and base what they think on that)...I just end up knowing it somehow. A recent example of this would be a girl I know from work. I decided to talk to her (when I finally got a chance) about three months after I started working there (the most I ever said to her before that was 'hi' or 'good morning'), and the more I got to know her, the more I proved myself right about every last detail...
A less recent, although still current, example, would be when I met my step-dad for the first time. The moment I saw him, I knew he would be no good for my family (especially mom) and that he would only cause trouble, and many things that I saw him do/say as time went on only strengthened that feeling. I had actually planned on advising mom not to marry him, but she seemed happy at the time, so I decided not to. Only a good deal later did I find out that not only had he been treating her like crap since their honeymoon (and continues to do so, along with physical and verbal abuse...the physical abuse has stopped lately, but only because the police got involved), but also that he has a ton of mental problems like bipolar disorder, schizophrenia, paranoia, extreme OCD, manic depression, and he's very egotistical, prideful, controlling, manipulative, and blows up for the stupidest little reasons. My mom and I have gone through so much shit because of him....I sometimes really do regret keeping my mouth shut.