Drag and Drop vs Double Click behavior

1. What is the difference between double-clicking and drag and drop?
2. What is double-click drag?
3. Is double-click accessible?

What is the difference between double-clicking and drag and drop?

Use the Mouse to Point, Click, and Drag

To click is to depress then release the left mouse button. Click means to depress it once; double click is to click the mouse button two times; triple click is to click the mouse button three times. Right click is to click the right mouse button.

What is double-click drag?

To double-click, tap twice. To drag an item, double-tap but don't lift your finger after the second tap. Drag the item where you want it, then lift your finger to drop. If your touchpad supports multi-finger taps, right-click by tapping with two fingers at once.

Is double-click accessible?

Double-clicking in a web context is extremely uncommon, so most users won't even think to do it. The uncommonness of double-clicking isn't strictly an accessibility issue.