Web 1.0, Then 2.0
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
The Web's first phase limited users mostly to reading and selecting pages; the second added interactivity — which meant maintaining state, heavier servers, and a clean separation of rendition, business logic, and data.
Show
A read-only bulletin becoming a store with a cart is the transition in one site.
Watch for
Interactivity's price was complexity, paid server-side first.