Project manager: "What's technical debt? Explain it to me like I'm 6 years old"

Devs:

(source: "Richard Scarry's Storybook Dictionary" : https://archive.org/details/1scarryRichardStorybookDictionary/page/n56/mode/1up )

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@pierstoval I still do not know what technical debt is. It is because I’m not very smart.
@GeoffreyWinn maybe you just don't work in the tech industry, no lack of smartness in that
@pierstoval Well if you say so.
@GeoffreyWinn I mean, I don't know, do you work in the tech industry?
@pierstoval No, I don’t think so.
@GeoffreyWinn Do you want some explanations on the meme? It might be less funny afterwards, but at least you'll get it
@pierstoval Hm, that sounds good. I do like a good explanation.
@GeoffreyWinn Simple format: technical debt is the amount of undocumented, complex, hard-to-maintain code or software architecture that developers put in their projects, and if they ever leave, all of that is lost and the remaining devs (or the upcoming ones) will not know what to do with it.
If they touch it, it has high risk of breaking, and if they don't, it then won't be possible to optimize or enhance it.
Since it's tech-related, and hard to recover, that's why it's called "technical debt".