Recently in discussion and lecture we discussed the Big Five traits. The Big Five traits consist of openness to experience, extraversion, agreeableness, neuroticism, and conscientiousness. If you want a description of each of the traits, here is a link.
A person is not just one of these big five traits, everyone is a combination of each of the traits; more or less of each of the traits. It seems to be this combination is what makes everybody unique.
There are many personality tests out there, but here is one that I found right off of google.
I believe the big five traits are important to psychology because without them we would have a difficult time organizing people with different personalities. Obviously these big five traits can not describe everything about everyone, but they are very helpful understanding the main differences in personalities among different people.
I have not take this personality test i have provided a link to, but I would say I would score high in conscientiousness and agreeableness. I am organized and like things structured and well planned out. I also am very laid back and try to avoid arguments at all costs, therefore I tend to be very cooperative with others.