Many laptops have webcams already built in to the device.
For PCs: Open your Start menu and click “Devices and Printers.” Navigate to your webcam and right-click on it. Select “Properties” to review the status of your hardware. Windows will tell you that the device is working properly, and you may begin to use your webcam for video conferencing, video blogging and more.
For Macs: Go to Finder and select the “Applications” tab. Click on “Photo Booth.” Your webcam should turn on.