Situational vs. Clinical/Chronic Depression

Depression is a common theme in the realm of psychology, but what a lot of the common public don´t know is that there are different types of depression, and have various contributing characteristics.  Until I came to UNI, I had always thought that to have depression or some mental illness  - what have you, was wrong and it only happens to "those people."  It wasn't until I realized myself that I had depression.  This 1st article below is about situational vs. clinical depression.  "The difference between situational depression and other types of depression is that situational depression, as its name suggests, is caused by life's situations, or life events. In other words, situational depression is brought on by life."  The positive aspect with situational depression is that it is more or less temporary, our lives are constantly changing, and the more good things are happening in our lives, the better we feel.  But on the other side of the spectrum, any drastic event can leave our self thoughts and feelings hanging by a thread.
http://www.articlesbase.com/health-articles/situational-depression-brought-on-by-life-62752.html

The 2nd article has a lengthy series of questions that would be helpful for someone who is thinking they may have depression and wants to put it in context. 
http://www.livestrong.com/article/14734-handling-depression/