Personal finance is the application of the principles of financial economics to an individual's (or a family's) financial decisions. It asks, "How much money will you need at various points in the future?" and "How do you go about getting that money?". It deals with questions like:

• What is my annual income?
• How can I increase my income?
• What are my annual expenses?
• How can I reduce my expenses?
• How do I best budget my available income each year?

Source: http://en.wikipedia.org/wiki/Personal_finance