People new to using RFID often think RFID tags are like bar codes, but in reality, there are big differences. For example: just because you see a tag doesn't mean your RFID equipment will see it. Contrarily, if you can't see a tag, it doesn't mean your RFID equipment won't read it. Confused yet?
The fact is, there is a lot to know about RFID tags and it's not a simple as people would like it to be.
The RFID Network has put together a series of articles and videos that will help you understand: