The web can to direct you to primary sources, but it is not one. You may safely use it as a starting point.
reliable and relevant to your question.
Sotware.com is a reliable source to purchase software from. You should always do your research on the product description before purchasing to make sure it is compatible with your computer.
To access the source file for this URL, you will have to right-click on the properties. You can check to see if Answers.com is shared with other sites or networks.
Information that you can trust would be termed reliable. If you aren't sure of the source, or the source is someone that you don't trust, then the information would be unreliable, and you wouldn't count on it in an important situation. If the information is reliable, then you might trust it without doing your own research.
Thinking about how the source material applies to your question
Reliable is an adjective, and source is a noun.
Reliable Source Music was created in 1997.
its a source
In the Year of 1999 Answers.com was created
The founder of Answers is Bob Rosenshein.
Based on research I just recently performed, I have come to the conclusion that WebMD.com is a very reliable source. A few of the company's direct staff members are medical/healthcare providers/professionals, having licenses in the field of medicine. All of their colleagues at their sister company, MedicineNet.com are all medical/healthcare providers/professionals. To answer bluntly, yes. WebMD is a reliable source.
information is reliable and credible. It's important to verify the source's authority and accuracy to ensure the information contributes positively to your research essay and supports your argument effectively.