Header info refers to the encoded instructions found at the beginning of a digital file that tell a computer how to interpret the data that follows. In image files, this information defines key properties such as file type, structure, and how the image should be displayed.
For example, header info can indicate that a file is a JPEG, along with details like dimensions, colour depth, and compression. Understanding header information is important for photographers and digital professionals, as it ensures compatibility across software, proper file handling, and accurate image rendering.