.COM

.COM is a top level domain (TLD) that signifies a commercial business or site.  This top level domain was the first to be created when domain names became available.

It was named .COM because it was only available to business who were willing to pay the high fees.  But as more and more individuals and businesses created websites they needed domain names so prices started to drop.

These days, it is harder and harder to find a unique domain as more and more people are registering them as they are the most common and distinctive top level domain.

Related web hosting dictionary terms:
.NET
.ORG
top level domain (TLD)

Glossary Definition by WebhostingGPS.com