Dual Pixel Raw capability arrived with the Canon EOS 5D Mark IV, and many of the latest EOS R mirrorless models also have the option. When active, the camera stores the readout from both of the photo sensors that are within each pixel. Similarly to how we see slightly different images from left and right eyes, dual pixels capture different views of the same subject which can then be manipulated with DPP’s Dual Pixel Raw tool.
Using DPP to adjust Dual Pixel Raw images, you can slightly move the point of sharpness, it’s almost as if you get to slightly change the focus ring after the shot. Micro adjustment is better suited to portrait images, as the amount of adjustment is dependent on the depth of field captured, so with macro subjects there’s little adjustment possible.