Mathematics, Science, and Computers
- .cdf (formerly known as "AIA Format"), the ANDI/netCDF scientific data interchange file format
- Comma_delimited Format - now referred to as .csv (comma separated values)
- Channel Definition Format, an XML standard
- Charging Data Function, in the Session Initiation Protocol (SIP) standard
- Cohen-Daubechies-Feauveau wavelet
- Collider Detector at Fermilab
- Common Data Format, NASA software
- Windows Compound Binary File Format (sometimes "Compound Document Format" or "Composite Document File"), used in Microsoft Office from Office 97 to (optionally) Office 2007
- Compound Document Format, a set of W3C standards
- Cumulative distribution function
- Computable Document Format, a format for interactive data visualizations
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