The oldest and most commonly used TLD extension in the world, .com is the Internet standard for domain names and is ranked #1 Top TLD in the world. For the past 15 years .com has been providing service of 100% operational accuracy and stability. There are currently over one hundred million .com domain users that were attracted to the extension's reliablilty and security. This also includes 97% of the top 100 brands who have registered for a .com domain.
.COM is short for COMMERCIAL because originally this TLD was suppose to be used for commercial organizations and purposes, but the restriction was dropped when ".org" and ".net" were introduced with unrestricted regulations.