A bitmap is a type of digital image that represents pictures using a grid of tiny squares called pixels. Each pixel can display a specific color, and together they form the complete image. The term "bitmap" comes from the computer programming terminology, where "bit" refers to the smallest unit of data and "map" indicates a representation of data. Bitmaps are commonly used in various applications, including digital photography and graphic design. They can be saved in different file formats, such as JPEG, PNG, and BMP. However, bitmaps can lose quality when resized, as they are resolution-dependent, meaning their clarity is tied to the number of pixels in the image.