The first .com was introduced January 1985. It was created to represent the “commercial” intent of a website.
.com, .net, and .org are the original Top Level Domains. (TLD)
.com was for commercial websites but have become so popular that whether it is a blog or recipe website, the .com is the preferred choice.
.net is typically associated with network services.
.org is the short version of organization. It started as a TLD for non-profits but that no longer applies.
I can’t remember where .info fit in there…I’ll have to research it.