No, a camera or a microphone is not required to attend a Webex meeting. A camera can be used if you would like attendees to be able to see you face-to-face, but you can also just share your computer screen or use only the audio portion. With every Webex meeting, users have the option to dial in using a regular telephone or cellphone if they do not have a microphone on their computer. Most PC-compatible cameras should work with Webex.