1.2.5. Data Compression

What does Lossy Compression do to files?

• Increases the file size and keeps the same quality
• Eliminates no information at all
• Decreases the file size and keeps the same quality
• Eliminates unnecessary information in a file to reduce file size

What is compression?

• To convert one file to another
• To reduce the size of data to save space
• To minimise the time taken for a file to be download
• To compress something by pressing it hard

What is Lossless Compression?

• No information is lost but file size is increased
• There is no loss of information at all after compression
• Files which have the exact same data after compression
• Compression involves an algorithm

What type of compression does the ZIP format use?

• Lossy
• Lossless

What type of compression would you use to compress a text file?

• Lossy
• Lossless

When Lossy compression is used data is lost?

• True
• False

Uncompressed audio and video files require less memory than compressed files....

• True
• False

TRUE or FALSE: Some file formats are able to support both lossy and lossless compression

• True

• False

Kara is using an app to convert printed text into e-books that she can read on her phone. What type of compression would be appropriate here?

• Lossy

• Lossless

Jaspreet and Mark are recording a podcast that they will be uploading to the internet so that listeners can download or stream it. What type of compression is suitable for the sound file?

• Lossy

• Lossless