Description: The header is the title or top part of a document or data structure that provides essential information about its content. In the context of programming and software development, a header can refer to the initial section of a file that contains metadata, instructions, or definitions that are crucial for interpreting and processing the content that follows. Headers are fundamental in various file formats, such as HTML and XML, where they help define the structure and style of documents or data. Additionally, in the realm of networking, headers are used in data packets to transmit information about the source, destination, and type of data being sent. In summary, the header acts as a guide that facilitates the understanding and handling of the information contained in a document or data structure.
