Compression

• What does it mean to compress a file?

  To make its size smaller
• What is one benefit of file compression?

  Files take up less storage space
• How does compression affect file transfer speed?

  Files can be transferred quicker
• What is another benefit of compression related to file access?

  Files can be read or written to quicker
• What are the two methods used to compress files?

  Lossy and Lossless
• What does lossy compression do to a file?

  Removes data that cannot be heard or seen
• How does a lossy algorithm analyze an audio file?

  It removes inaudible frequencies
• What happens to the data in a file after lossy compression?

  Data is removed permanently
• In what types of media is lossy compression commonly used?

  Images, audio, and video
• What is the main characteristic of lossless compression?

  No data is permanently removed
• What happens to a file when it is decompressed after lossless compression?

  It returns to its original form
• Why is a lossless compressed file usually larger than a lossy compressed file?

  No data has been permanently removed
• When is lossless compression typically used?

  With files that cannot lose data
• What types of files commonly use lossless compression?

  Executable files and word documents
• What is the effect of lossy compression on audio quality?

  Audio quality decreases
• What are the benefits of compressing a file?

  • Less storage space required
  • Faster file transfer
  • Quicker read/write access
• What are the differences between lossy and lossless compression?

  • Lossy: Permanently removes data, smaller file size
  • Lossless: No data removed, original file restored
• Which type of compression should a student use for a Word document and why?

  • Use lossless compression
  • To retain all data and quality