What does the 7-speed dual clutch of automobile gearbox mean?

Powershift DCT (powershift) is actually a combination of two sets of manual gearboxes.

DCT has the characteristics of fast shifting and upshifting, and is generally used for high-end models or supercars, such as Porsche's PDK dual-clutch gearbox. Dual clutch is not the best choice for daily commuter cars because of its high cost. Because the dual-clutch gearbox is heavier than the traditional manual gearbox, the low-grade setback of the dual-clutch gearbox of many models will be very serious.