These classes provide access to a tag technology's features, which vary by the type of tag that is scanned. A scanned tag can support multiple technologies, and you can find out what they are by calling {@link android.nfc.Tag#getTechList getTechList()}.

For more information on dealing with tag technologies and handling the ones that you care about, see The Tag Dispatch System. The {@link android.nfc.tech.TagTechnology} interface provides an overview of the supported technologies.