A file format is a standardized rulebook that defines how data is encoded, structured, and stored as raw bytes on a computer disk. It essentially instructs software applications on how to correctly read, display, and process the bits of information inside a file. How File Formats Work
Raw Bytes: Every file on your computer is just a sequence of raw numbers from 0 to 255.
The Rulebook: The format tells your system whether those numbers represent text characters, pixel colors, or audio samples.
File Extensions: The suffix at the end of a filename (like .docx or .png) acts as a label. It tells the operating system which software program to launch by default when you click it. Core Categories of File Formats
File formats are categorized by the type of data they handle. Documents and Text
.txt (Plain Text): Stores raw text only with zero formatting, fonts, or styling.
.docx (Microsoft Word): A rich document format used heavily by Microsoft Word that supports advanced formatting, tables, and images.
.pdf (Portable Document Format): Developed by Adobe to lock layouts so documents look identical across all devices. It is highly reliable for contracts and official forms but difficult to edit. Data and Spreadsheets File formats – How To FAIR
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