What Are They?
Picture Element
In digital imaging, a pixel, pel, or picture element is a physical point in a raster image, or the smallest addressable element in an all points addressable display device; so it is the smallest controllable element of a picture represented on the screen.
Image Resolution
The term resolution is often considered equivalent to pixel count in digital imaging, though international standards in the digital camera field specify it should instead be called "Number of Total Pixels" in relation to image sensors, and as "Number of Recorded Pixels" for what is fully captured.
What Are They Used For?
Picture Element
Picture elements are used in all raster type graphics as they are made up of pixels which is an abbreviation of picture element, "pix" being picture and "el", being element. Where as vector images use lines rather than pixels.
Image Resolution
Image Resolution is used for the detail that an image has. The resolution of an image is how clear the image is to see. it is also used in the clarity and sharpness in an image relating to printers and monitors which means the higher the resolution of an image the the sharper and clearer it will be, it will also help to see the details in the image a lot better.
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