It switches on automatically when the Photobooth or iChat apps are opened.
You want to use a built in software called "photo booth". Open your finder and go to the applications folder. The icon for photo booth will look like a red curtain.
Yes. The new Macbook Air does have a frontward facing FaceTime camera.
For built in: Open Photo booth or other webcam software. For USB, plug in it, then open your program.
The MacBook Air has a built in iSight camera. To add another camera you would need to specify what you wanted to achieve that you could not with the iSight.
You can record video from the built in camera directly into iMovie, PhotoBooth or any other application that recognizes the camera.
iSight is simply the built-in camera on the Mac. In order to use the iSight camera, you will need to open an application that involves the use of the camera. Some programs include iChat and Photo Booth.
Built in camera means that a computer (or other device) has a camera built in to it's body. On a Mac for example the camera is located in the centre above the screen. The camera can be used for video chatting/conferencing, or taking pictures with PhotoBooth etc.
For your book files, you should choose a program to open your files. On Mac as iBooks is a built-in reading app, I recommend you iBooks. Maybe you can have a look at reading epub on Mac.
Macs have come with built-in cameras for many years. Most USB webcams can be used with older Macs that do not have a built-in camera but do have a USB port.
The Mac's built in web cam is controlled by software so launching PhotoBooth, iChat, FaceTime or iMovie, all of which come with a Mac, will activate the camera. There are numerous other applications, such as Skype, Messenger etc., that will use the camera.
Yes, MacBookAir supports video conferencing with the built in FaceTime camera. You can use Skype, FaceTime or any other similar app.
Many IMac computers and displays have built-in Facetime HD camera located near the top edge of the screen.