A bit is the smallest unit of digital information, representing one of two possible values: 0 or 1. In digital imaging, a bit typically indicates pixel state, where 0 represents white or "off" and 1 represents black or "on". Bits are the foundation of image encoding, storage, and processing, and combining multiple bits allows for greater colour depth, detail, and tonal range in digital photographs. Understanding bits is essential for photographers working with digital file formats, image resolution, and post-processing workflows.