HDR is a term from the world of photography: HDR Photography Creates an image with a wider tonal range that is larger than normal with 1 image. In some cameras, HDR is an option that can be selected: In this case, multiple images are created sequentially and the camera combines it to 1 image. Read More
USB is a standard for connecting peripheral devices (mouse, keyboard, scanner, printer, photo camera, etc.) to a computer. USB has come as a replacement for parallel and serial ports. One advantage of USB is that it can take care of the power supply of the connected peripherals, also USB devices can be connected without having to restart the computer (also called hot-pluggable or hot-swappable). By now we have already arrived at version 3 of this standard. Https://www.youtube.com/watch?v=-yExrqFfdsU