They no longer have these purposes, they're generic (See https://en.wikipedia.org/wiki/Generic_top-level_domain). The 3 domain names you listed are controlled by Verisign, and due to the popular notion that “.com” is *the* domain for comapnies, etcetera, it has become a monopoly, with all the bad things it entails. I encourage anyone registering a domain to *avoid* any of these 3 or any other controlled by Verisign. There are lots of generic top level domains and several get added every year. Wikipedia has more information about this (It has articles for the most popular TLD such as “.com”) and it can also be found in any book about DNS.

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