Synaptic Touchpad -

Pinch or stretch with two fingers to zoom in and out of images and maps.

Use two fingers to scroll vertically or horizontally through documents and web pages. Synaptic Touchpad

Customize "tap-to-click" or "two-finger tap" for right-clicking, which can often be configured through Windows Settings or the Registry. Pinch or stretch with two fingers to zoom

Many models support "tap and a half" gestures, where you double-tap but hold the second tap to drag an item. The Role of the Synaptics Driver Synaptic Touchpad

The is critical software that allows the operating system to communicate effectively with the touchpad hardware. Without it, the touchpad may only function as a basic "PS/2 Compatible Mouse," losing all multi-touch gestures and specialized settings.

Two finger scroll not working on ASUS notebook - Microsoft Q&A