What does auto depth of field priority mean?

When you focus not every thing in front of the camera will be in sharp focus.Away from the camera something will be in focus.(all before this will be gradually blurred.)Now from this "in-focus" point to some more distance things will look sharp. After that point things will again gradually blurr.The area between these two points, within which things look sharp is called depth of field. What will be the distance between these two points or what is the range of septh of field? It mainly changes with the aperture setting. It is an 'inverse' relation; larger the aperture, lesser the depth of field. (Some lenses have a scale for this on their rings.)

Sometimes we want to 'fix' the depth of field.Modern DSLRs help us achieve this in a particular setting.That setting is called auto depth of field priority setting.

How you actually do it depends on the camera brand. There are good sites. Please try YouTube with this phrase "setting auto depth of field in canon' for example.