Daily Life — Questions & Answers

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• What Is .OVR
  .OVR files are overlay pyramid files primarily used by ArcGIS to store pyramid layers of raster datasets, enabling faste...
• What Is .Onion
  A .onion domain is a special-use top-level domain (TLD) designating anonymous hidden services on the Tor network, first ...
• What Is .PBIX
  .PBIX is Microsoft Power BI Desktop's native file format for storing interactive business intelligence reports, dashboar...
• What Is .PHONY
  .PHONY is a Makefile directive that marks targets as non-file tasks, telling the Make build system to always execute the...
• What Is .PKL
  .PKL is a file extension for Python pickle files, a binary format used to serialize and deserialize Python objects into ...
• What Is .PPTX
  .PPTX is the file format for Microsoft PowerPoint presentations introduced in 2007 as part of Office Open XML. It stores...
• What Is .PSD
  .PSD (Photoshop Document) is Adobe Photoshop's native file format, introduced in 1990, that preserves layers, effects, m...
• What Is .Pbm
  PBM (Portable Bitmap) is a simple monochrome image format created in 1989 by Jef Poskanzer that stores black and white i...
• What Is .RAR
  .RAR is a proprietary file compression format developed by Eugene Roshal in 1993 that compresses files with ratios 15-50...
• What Is .RAW
  A .RAW file is an uncompressed digital image format containing all data captured directly from a camera's image sensor w...
• What Is .RIP
  .RIP is a generic top-level domain (gTLD) launched in 2015 specifically designed for memorial, tribute, and remembrance ...
• What Is .SAV
  .SAV is a file extension used to store saved game states and application data, commonly found in video games, emulators,...
• What Is .SES
  Amazon Simple Email Service (SES) is a cloud-based email sending platform launched by AWS in 2008 that enables businesse...
• What Is .SFK
  .SFK files are audio peak cache files created by Audacity that store compressed waveform peak data for rapid audio displ...
• What Is .SLD
  SLD stands for Second-Level Domain, which is the domain name section directly below a top-level domain (TLD) in a web ad...
• What Is .SMC
  .SMC is a file extension for Super Famicom ROM images, which are binary dumps of game cartridge data from Nintendo's 16-...
• What Is .STL
  .STL (STereoLithography or Standard Tessellation Language) is a file format developed by 3D Systems in 1987 that represe...
• What Is .SYS
  .SYS files are system files in Windows operating systems that contain device drivers and configuration information neces...
• What Is .Store
  .store is a generic top-level domain (gTLD) introduced in 2015 as part of ICANN's new domain expansion program, allowing...
• What Is .TGA
  .TGA (Truevision Targa) is an image file format developed by Truevision Inc. in 1984 that supports color depths from 8-b...
• What Is .TMP
  .TMP files are temporary storage files created by applications and operating systems to hold data needed only during pro...
• What Is .TXT
  A .TXT file is a plain text document containing only unformatted characters, making it the most universally compatible f...
• What Is .VOB
  VOB (Video Object) is the container format used exclusively on DVD-Video media, introduced commercially on March 24, 199...
• What Is .WAV
  WAV (Waveform Audio File Format) is an uncompressed audio file format developed by IBM and Microsoft in 1991, based on t...
• What Is .WAV file
  The WAV (Waveform Audio File Format) is an uncompressed, lossless digital audio format developed by IBM and Microsoft in...
• What Is .WK4
  .WK4 is a spreadsheet file format used by Lotus 1-2-3 Release 5 and later versions, introduced around 1992 to replace th...
• What Is .WMV
  .WMV (Windows Media Video) is a proprietary video format developed by Microsoft in 1999 as part of its Windows Media fra...
• What Is .XIN
  .XIN is a generic top-level domain (gTLD) that launched in 2015, designed specifically for Chinese businesses and indivi...
• What Is .XLS
  .XLS is a binary spreadsheet file format developed by Microsoft in the late 1980s that became the default format for Exc...
• What Is .XLS file
  XLS is the binary file format used by Microsoft Excel for storing spreadsheets, standard from 1995 to 2003. It uses the ...
• What Is .XLSX
  .XLSX is a modern spreadsheet file format introduced by Microsoft in January 2007 as part of Office Open XML (OOXML), re...
• What Is .XYZ
  .XYZ is a generic top-level domain (gTLD) launched on June 2, 2014, offering a modern alternative to traditional domain ...
• What Is .Xauthority
  .Xauthority is a file stored in each user's home directory (~/.Xauthority) that contains authentication tokens for X11 d...
• What Is .aab
  Android App Bundle (.aab) is a publishing format introduced by Google in May 2018 that optimizes app delivery by generat...
• What Is .ac.in
  .ac.in is India's reserved second-level domain exclusively for accredited academic institutions including universities, ...
• What Is .ac.uk
  .ac.uk is the official domain extension reserved exclusively for academic and research institutions in the United Kingdo...
• What Is .accda
  .accda is a Microsoft Access locked database format introduced in 2007 that stores compiled, read-only versions of Acces...
• What Is .accdb
  .accdb is the file format for Microsoft Access databases, introduced in 2007 as the successor to the legacy .mdb format....
• What Is .acsm
  .acsm stands for Adobe Content Server Message, a file format used to distribute protected eBooks through libraries and d...
• What Is .adf
  ADF (Amiga Disk Format) is a standardized disk image file format that preserves the complete structure of Amiga diskette...
• What Is .adoc
  .adoc is a lightweight markup language for documentation created in 2007 that's more powerful than Markdown, supporting ...
• What Is .aero
  .aero is a sponsored top-level domain (sTLD) exclusively for the aviation and aerospace industry, established in 2001 an...
• What Is .agd
  .agd is a file extension for AgileGraph Data Format files, which contain raw data imported and processed by the AgileGra...
• What Is .aif
  AIF (Audio Interchange File Format) is an uncompressed audio file format developed by Apple in 1988, designed to store h...
• What Is .aiff
  AIFF (Audio Interchange File Format) is an uncompressed audio format developed by Apple in 1988 that stores complete aud...
• What Is .amr
  The .amr file format is an Adaptive Multi-Rate audio codec developed by 3GPP in 1999, specifically designed for compress...
• What Is .android
  .android is a specialized generic top-level domain (gTLD) reserved exclusively for the Android ecosystem, approved by IC...
• What Is .ang
  .ang is a generic top-level domain (gTLD) created under ICANN's New gTLD Program expansion that began in 2013. It functi...
• What Is .append
  .append() is a programming method that adds a single element to the end of a collection, most commonly a list or array, ...
• What Is .apple
  .apple is a branded top-level domain (TLD) operated exclusively by Apple Inc., approved by ICANN in November 2014 and ma...