Looking at a web address's domain suffix can help you figure out the purpose of the website. Knowing a website's purpose can help you figure out how trustworthy the site is.

Web addresses with the domain suffixes .com or .net are often websites run by businesses.

The purpose of these websites is usually to sell a product or a service.

The domain suffix .org is often used for the websites of non-profit organizations. The motive of non-profit organizations can sometimes be more trustworthy, because they are not focused on selling a product or service.

The suffix .edu is used for schools. Web addresses that end in .gov are sites that belong to government agencies, like the White House website.

Schools and government agencies are sometimes more careful about the quality of the information they post than businesses.

Looking at a website's domain suffix is part of figuring out how trustworthy the site might be, but it's important to also consider the other aspects of the site when you evaluate it.