.com is one of the oldest domain name who ends with .com. .com meaning is commercial and its is started using when enternet come. There are so many domain names who end with .org, .ind, .org. The reason of .com becoming so much popular is because of first mover advantage in the early stage of enternet everybody use .com and people got used to it thats why people till now also end up searching any website with ending .com. After few decade of internet entry .com got addopted by all countys beacuse of that it gets globle advantage. Lest open your enternet and search any big compamny website you defaulty end website by typing .com thats how much adopted .com is.
.com means commercial and this meaning .com got beacuse in early internet days .com is used by US government and there businessman who has contrect with the US government. Then it is used by hotels, small business and by used by so many people it gets a recognization and make its brand domain ending name in people mind and you can see thow famous .com is by gooing to any website you can find that 90% website has ended with .com thats how poupular it is. NOw anybody can buy there domain name with end .com by goodaddy and other domain buying platforms.
ICANN (Internet Corporation for Assigned Names and Numbers) is now managing and controlling .com domain name this organization has started by government in early stages of enternt buy now this this organization is independent and has all domain name rites and now any normal people can buy domain name which ends with .com. They can buy on Goodaddy.
This are the reasons why .com is always used in the end of most of domains. In short .com ger a first mover advantage and its adoption is also very fast thats the reason it is used on large scale now.
Did you ever noticed when we go to a shop for taking water we dont say gave me water bottle we say "Gave me a Bislari". Thats same thing is happend with Domain names when we want to search any companys website we always end up with .com