A lot of times when shooting outdoors on bright and sunny days, you will have a nice background but your subject is dark. The quick and dirty answer is to properly expose your subject and don't worry about the background. The quick and dirty answer does not work every time, and there are options available to you.
The word "photography" is derived from Greek, and means "drawing with light". Renaissance painters took great care to accurately paint shadows and highlights where they would be in real life. The lighting in each movie scene is carefully planned and laid out, the next time you watch a movie pay close attention to the lighting. Cinematographers use the same tools available to you when creating the lighting for movies scenes. The first video deals with reflectors and fill flash, the simplest tools available to you.
The next video I would like you to see deals with soft boxes, there is a lot you can do to create very flattering portraits with a few additional tools.
The last video shows you how to reduce the brightness of the background. Depending on what you're shooting, you don't have to choose between a nicely exposed background or subject...you can now have both.
These are all options available to you, but there are less expensive options too. Instead of a reflector, you can buy a piece of white foam core and use that as your reflector, you can even use a white cloth. You can use the same white cloth to diffuse the light reaching your subject. The more thought and care you put into lighting your subject will result in a much nicer photograph. Will you use any of these modifiers, its really up to you...but now you know what is available to you.