TV Cards are hardware components used in computers to receive television signals, allowing users to watch and record live TV on their PCs. TV cards are available in different formats, including PCI, PCIe, and USB, and can be used with both analog and digital TV signals. Some TV cards also offer features like DVR functionality, remote control support, and HD streaming. Online shopping for TV cards offers a range of options to suit different viewing preferences and broadcasting standards, from basic TV tuners to advanced models for digital and HD television.