1.2.5 Compression (Lossy, Lossless)

Question 1

Why is compression useful? (2)

Answer 1

It reduces file size (1) so files take less space on secondary storage (1)

Question 2

What are the benefits of lossy compression? (4)

Answer 2

Lossy means the decompressed file is not identical to the original (1) however the difference is unlikely to be noticed by humans. (1) Lossy will decrease file size (1) so files are easier to store or send. (1)

Question 3

What are the benefits of lossless compression? (2)

Answer 3

Lossless means the decompressed file is identical to the original. (1) The file size will decrease, but not as much as lossy. (1)