The term "Multiple Image Network Graphics" is not a standard or widely recognized file format. It's possible this refers to a proprietary or custom format used within a specific application or system, or it could be a misinterpretation or combination of terms related to image processing and networking. Without more context, it's difficult to provide a definitive description. However, assuming it's related to image data transmitted over a network, it likely involves encoding multiple images or image layers into a single file or data stream. This could be for purposes such as animation, image stacking, or transmitting complex visual information efficiently. The format might include metadata about each image, such as its position, size, and transparency. The encoding could use various compression techniques to reduce the file size and bandwidth requirements. The specific implementation would depend on the application's needs and the underlying network protocol. It's also possible that this refers to a collection of images stored in a database or other structured format, rather than a single file.