Depth
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
The depth of a tree is the number of steps from the root — how many choices deep a plan has gone, written d.
Show
The dinner tree runs depth 3: starter, then main, then dessert.
Watch for
Depth counts decisions, not time — a plan of five choices is depth five however long each takes.