The term "fast boil" is commonly used to describe a feature found on many modern induction cooktops, but it can also be used for other types of cooktops.
Induction cooktops are known for their ability to heat up quickly, which can significantly reduce the time it takes to bring water to a boil compared to traditional electric or gas cooktops. This is because induction cooktops directly heat the cookware using electromagnetic induction, resulting in faster and more efficient heating.
If your cooktop has a "fast boil" feature and it's an induction cooktop, then it likely utilizes the rapid heating capabilities of induction technology to achieve faster boiling times. However, to be certain whether your cooktop is induction or not, you should refer to the product manual or check the specifications provided by the manufacturer. Additionally, induction cooktops usually require the use of cookware with a magnetic bottom, so if your cookware sticks to the cooktop surface, it's likely induction.