this post was submitted on 06 Jul 2026
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Explain Like I'm Five
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It's like the contacts app in your smartphone where you keep the phone numbers of people so you don't have to remember them. The main difference is that a phone book has lots and lots of people so you can look up numbers for people you have never met. We used to get updated versions as printed books every year or so. These days, they still exist as apps or websites.