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The standard electronic grounding system used is the "single point ground", close to that single point the ground splits into two independent ground systems that never interconnect again at any other point: a high noise (digital) ground system and a low noise (analog) ground system. Each of the two ground systems can also split into sub-ground systems (again at a single point with the important thing being that once split they never interconnect again). This produces a grounding system that looks like a tree.
Another type of grounding system used is the "floating" or "isolated" ground. This type of grounding system is used for safety purposes and is often UL mandated in the US. In this type of grounding system the real ground used by the electronics is isolated from the user and all external metallic components or surfaces of the device.
These external components and surfaces are connected to a second ground called the "floating ground", which is connected to the real ground at a single point via a resistor and capacitor in parallel. The resistor provides DC current limiting to prevent a fatal shock, while the capacitor provides an AC bypass so that at high frequencies the two grounds still act as if directly connected.
If multiple power supplies are used, each with its own independent isolated ground, they may either be brought together at the common single point ground of the system, or kept totally independent if the systems they power can be kept completely electrically isolated (e.g. by using optical coupling to bring signals in and out).
Grounding in electronics is an art and an unnoticed error can cause endless painful hours of troubleshooting to locate and many more hours to fix.A
ANSWER: There many names for ground to distiguish one from the other like shield ground it carries no current because it is a shield an does because it carry the bulk of the power and so on. All grounds eventually tie to a single holy point . So why the difference in names because all perform a duty to carry current and the art is to make sure one do not interfere with the other
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