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Päiseandmetega refers to header data in computing. It is information that precedes the actual content of a file or message, providing context and instructions for its interpretation. This header data is not typically meant to be read by the end-user directly but is crucial for the proper functioning of software and communication protocols.

In the context of files, header data can contain details such as the file type, its size, creation date, and other metadata. For example, an image file header will specify the image format (like JPEG or PNG), its dimensions, and color depth. This allows an operating system or an image viewer to correctly display the image. Similarly, document headers might contain information about the author, version, and encoding.

For network communication, headers are essential for packet routing and data integrity. When data is sent across a network, it is broken down into packets. Each packet includes a header that contains the source and destination IP addresses, port numbers, and sequencing information. This allows the receiving device to reassemble the data in the correct order and know which application should receive it. Email headers are another common example, containing information about the sender, recipient, subject, and the path the email took through various servers. Understanding and processing this header data is fundamental to the way digital information is organized, transmitted, and understood.