What is the difference between depression and anxiety?

There are many variations of both anxiety and depression. Anxiety can be a temporary excessive worry or unease or it can be a more persistent or recurrent psychiatric disorder. The term depression is often loosely used to describe when someone is just feeling down or sad about a situation. The psychiatric definition of depression depends upon specific symptoms. For example, the symptoms of major depression are defined as lasting at least two weeks but usually they go on much longer. Those symptoms include: 
•    Distinctly depressed or irritable mood 
•    Loss of interest or pleasure 
•    Feeling worthless or guilty 
•    Poor concentration or indecisiveness 
•    Thoughts of death, suicide attempts or plans