What Address Endings Mean

.edu	.edu is always affiliated with universities, colleges and educational sites. Keep in mind that many Universities give their students free space to create websites so they are not always created by scholars or cover scholarly topics
.org	.org usually indicates that a site is run by a non-profit organization like Public Broadcast System (PBS) or the Red Cross. Although it is possible for ANYONE to buy an .org ending for their web site- even for profit companies! Keep in mind that organizations like the Ku Klux Klan are also eligible to have a .org ending in their URL

.com	.com is the most popular kind of site because companies want to advertise their products to Internet consumers. Keep in mind that some .com sites that provide medical or "scholarly" information may just be trying to sell you their product.

.net	.net is the latest of new endings for URLs. It stands for Network. Some of these sites are not-for-profit, but others are.

.gov	.gov is exclusively used for sites owned and operated by the government. No one but the government is authorized to use this ending so it is pretty safe to trust the data and source for most information (depending on your political stance that is!).