RAM is working memory – how much information you can keep in your head while trying to solve a complex problem before needing to stop and write things down.
SD cards and other “hard” storage is permanent memory – how to do arithmetic, multiplication tables, formulas, along with your grandparents’ phone number, childhood address, and the lyrics to dozens of songs. If you could only remember as little as you can hold in your head at one time you wouldn’t be able to do much at all.
So RAM lets your computer think really fast. Your hard drive / SSD lets it store files and software.
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