Explication au tableau blanc

Make a 20-second 16:9 whiteboard explainer for [who will watch, e.g. non-technical colleagues], playing [where, e.g. the internal wiki]. Use only the title, three steps and closing line below; don't add claims. Clean white board, black and blue marker.

Scene 1: the italic handwritten-style title writes itself letter by letter and a blue marker underline sweeps under it. Scene 2: three stations draw themselves in black marker (an outlined arrow, a box with a blue tick, a light bulb with blue rays), each with its label, connected by curved gray arrows. End frame: the closing line writes in blue at the bottom and a blue marker loop circles it.

Title: [e.g. "How a cache makes apps fast"]
Three steps: [e.g. "Ask — The app asks for data", "Check — The cache answers if it already knows", "Remember — Otherwise fetch once, keep a copy"]
Closing line: [e.g. "Fast = not asking twice."]