Final answer:
A video capture card in a computer typically uses a digital camera connected via USB or a memory card reader as a source. Built-in memory card readers in modern computers have made the process even more convenient. Cameras may come with their own software or can be managed by programs like iPhoto or Picasa.
Step-by-step explanation:
When installed in a computer, a video capture card typically uses a digital camera or a memory card reader as a source. To transfer images or videos from the camera, you may connect it directly to the computer via a USB cable, or use a camera dock linked by a USB cable. However, many users prefer to use a memory card reader, a device with slots for different types of memory cards that can be connected to the computer with a USB cable. By inserting the memory card into the reader, the computer can access the files as though the card were another drive on your desktop.
Most modern computers now come with built-in memory card readers, obviating the need for external devices. Additionally, digital cameras often include software for image downloading and organization, and there are also popular programs like iPhoto for Mac or Picasa for both Mac and Windows available for these purposes.