in essence, a dynamic release is, or is as close to as possible, a 'surprise' release. difficult to achieve with fingers, easiest with a release aid.
when the string fingers unconscientiously slip off the bowstring at full draw, your string hand moves quickly to the rear of your head and inline with the arrow. the bow punches forward and not down or either side. this dynamic release is achieved by constantly pulling rearward, even after achieving anchor. there was a time when this was called the 'push-pull' method of aim/release.
a static release is when you conscientiously stop pulling, and tell yerself to let go of the string.
most top archers never stop pulling on the string, come to anchor, feel their back muscles take on the load, continue the rearward string pressure, allow the fingertips to roll off the string, string hand flies directly rearward, bowhand and bow punch directly forward, arrows finds the mark.