system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Where do my antibodies get stored when I’m not using them?

Like if I’m vaccinated for a bunch of diseases and I’ve built up antibodies for the diseases I’ve had... where do those antibodies go when they’re not active? Or is it more like a software update in that it’s more my body knows how to create those antibodies when needed not that they’re physically kept in some subdermal bat cave waiting to fight crime when called upon?
gpt
Some are stored in the spleen (that's why after the spleen is removed because of accidents or so, vaccinations might have to be repeated), but yeah, your body also learns how to produce them.

Making an antibody that fits is a trial-and-error thing, they body will produce some and test if they work.
So if you are vaccinated your body had the chance to try them out with the harmless version and knows what will fit when the real thing comes- time is saved, reaction is faster.