On DSLR cameras, each one has a dial with different settings on, this is a picture of the dial. The A on the dial means Aperture priority:
This is a setting that allows the user to choose a specific aperture value while the camera selects a shutter speed to match. This creates the perfect exposure.
The main purpose of using the aperture priority mode is to control the depth of field, DOF is the distance between the nearest and furthest away object in the picture, which may or may not be more sharp than other things, it is mainly used in landscape and portrait photography as by using a wide aperture it gives you the opportunity to put the background out of focus and have the main object as sharp as possible.
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