How to understand Time.deltaTime properly?

[BPPX]

Forgive me for asking such a stupid question, but I’ve looked at the documentation and Google, and I don’t think any of the explanations for Time.deltaTime are clear enough, because I don’t know the exact moment (point in time) they are describing.

So I drew a diagram, for Frame1~3, what is the value of Time.deltaTime that they get in the Update function and how is Time.deltaTime calculated?

[DevDunk]

It calculates the time between the currently presented frame and the frame before that

So at t2 it will do 0.2-0=0.2 and use that data for frame 2
at t3 it will do 0.5-0.2=0.3 and will use that for frame3
etc, etc,