Not slides with a robot reading them. It writes the scenes, draws them in the same hand the diagrams use, and narrates the whole thing — so the explanation you asked for arrives as something you can watch instead of something you have to read.
Send it to someone with one link. They do not need an account, and it plays for them exactly as it played for you. Delete the share and the video goes with it.
you“explain how a database index actually works”
→5 scenes · drawn · narrated
→a 90-second video in the conversation
→share link · plays for anyone you send it to
spends your daily allowance, not a separate bill