The Full form of COM is COMMERCIAL. COM is a top-level generic domain used on the Internet’s Domain Name System. It was considered as one of the original top-level domains that has grown to be the largest in use. Currently, it is operated by Verisign. COM is consistently pronounced as dot-com, and has entered the common language this way. Like .com; .co.in is also a domain name system. So .com is generally used to categorize the specific group of websites. It is normally used for commercial sites. Like .com, other domain names are also used for various purposes such as; .edu for educational sites, .org is used for organisational sites, and .gov for government sites.
When we see a website with .com extension, it means the operations of that site are primarily or entirely internet-based. This is what is called as a “Generic top level domain” address. The Country Code Top-Level Domains (ccTLD) are country specific like .IN (for India), .AU (for Australia), .US (for the United States). The Sponsored Top-Level Domains (sTLD) are like .GOV, .EDU, .MOBI, etc. and the Generic-Restricted Top-Level Domains are like .NAME, .BIZ, etc. ICANN (Internet Corporation for Assigned Names and Numbers) is the international organization for the assignment of IP addresses and domain names.