I don't have one, and I don't want one, so the precept is wrong. Is there an alternative prize?
Having already explain basic computer concepts, it would be comparatively easy to explain to my mother, but if one was to assume someone that knew little about technology, it's always best to keep things very simple, even if it means sacrificing some accuracy.
I'd just say it makes starting things go faster, but does not make much difference with something after it's already started. The downside is it's more expensive for the capacity.
Anything more, you get a glassy, confused look, and they give up understanding any of it, and just figure they'll ask their equally uninformed friend, who'll give an answer she heard from someone else (her cousin's dog trainer, who's a nerd so must know), but somehow is simple enough to make sense (and inaccurate enough to be detrimental to her understanding). So, you don't bring up the failure with write cycles, or power characteristics, or thermal differences, or different types of SSDs, or talk about magnetic media, or ever mention "Winchester" technology, or talk about differences between RAM and "permanent" storage, etc... I learned the hard way, when you tell people more than they want to hear, or get it accurate enough to where you feel comfortable with what you've said, you lost your audience by the second sentence.