system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If I have 600 MB of storage left on my phone, why do I get a warning for "insufficient storage" when downloading a 15MB app?

Per the title. My phone only has 8GB of storage. Sometimes I get to the point where I only have 600 MB of storage left. If I try to download an app that's only 15 MB, it tells me there is insufficient storage and won't download. Can someone ELI5 why this happens?
gpt
Super simple answer: Your stomach tells your brain that you are full before the food is backed up to your throat.

I think most operating systems try to reserve a little space in case it's needed for something essential.