Write down the necessary components of a USB bus 
The Universal Serial Bus (USB) is a standard interface used to connect devices to a computer system. The USB bus consists of several components, including:
Host controller: The USB host controller is the component responsible for managing the USB bus and controlling communication between USB devices and the computer. The host controller can be integrated into the motherboard of the computer or can be a separate add-on card.
USB connectors: The USB connectors are the physical ports on the computer or device that are used to connect USB devices. There are several types of USB connectors, including USB Type-A, Type-B, Type-C, and Mini-USB.
USB cables: The USB cables are used to connect USB devices to the USB connectors on the computer or device. USB cables come in different lengths and types, and the type of cable used depends on the type of USB connector on the device.
USB devices: The USB devices are the peripherals or devices that are connected to the USB bus, such as keyboards, mice, printers, external hard drives, and flash drives. USB devices have their own internal controllers that communicate with the USB host controller to exchange data and instructions.
USB hubs: A USB hub is a device that allows multiple USB devices to be connected to a single USB port on the computer or device. USB hubs have their own internal controller that communicates with the USB host controller to manage the flow of data between devices.
USB drivers: USB drivers are software programs that enable the computer to communicate with USB devices. When a USB device is connected to a computer for the first time, the appropriate USB driver must be installed to enable communication between the device and the computer.
In summary, the necessary components of a USB bus include the host controller, USB connectors, USB cables, USB devices, USB hubs, and USB drivers. These components work together to provide a standard interface for connecting devices to a computer system.