there is no standard dishwasher mode known as "auto soak mode." Dishwashers typically offer standard cleaning cycles like "Normal," "Heavy," "Light," "Quick Wash," and sometimes additional cycles for specific types of items like "Pots & Pans" or "China." However, new features and technologies may have emerged since then, so it's possible that some dishwasher models introduced an "auto soak mode" or a similar feature.
Generally, the purpose of a soaking phase in a dishwasher is to soften and loosen dried-on or tough stains before the actual cleaning cycle begins. It allows the dishwasher to apply water and detergent to the dishes, letting them soak for a period to break down and loosen the food particles or stains. After the soaking phase, the dishwasher continues with the regular cleaning cycle, which includes spraying water and detergent, followed by rinsing and drying.
If you have a dishwasher with an "auto soak mode," I recommend referring to the dishwasher's manual or contacting the manufacturer for specific details on how this feature works and its benefits.