Definition: It's a .txt file in the header.conf format. It contains headers for various files, like `myfile.txt`, `myfile.pdf`. The `.0700` character indicates it's a header file. Detailed definitions include: - Header (Header) is the first line of any file that starts with `#`. - .0700 is a comment in Unix command lines indicating a new line, typically at the beginning of the next command. - `header.conf` is a file used by headers to define their content, often in configuration files.