What is the difference between lossless compression and lossy compression?

What is the difference between lossless compression and lossy compression?

• A. Lossless preserves all original data, allowing exact reconstruction; lossy compression discards some data to reduce size, sacrificing perfect fidelity.
• B. Lossless compression reduces file size by discarding some data.
• C. Lossless compression increases file size.
• D. Lossy compression preserves all original data.

Answer: (A)

The main idea is how lossless and lossy compression differ in preserving data. Lossless compression reduces a file’s size without losing any information, so when you decompress it you get exactly the original data back. This is important for text, software, and other data where even a small change would cause problems. Lossy compression also reduces file size, but it does so by discarding some data during encoding. The result after decompression is not identical to the original, though it can be visually or audibly very close. This approach works well for media like photos, music, and videos where a small loss in quality is acceptable in exchange for much smaller files. So the statement that best describes the difference is that lossless preserves all original data for exact reconstruction, while lossy discards some data to achieve smaller size.

The main idea is how lossless and lossy compression differ in preserving data. Lossless compression reduces a file’s size without losing any information, so when you decompress it you get exactly the original data back. This is important for text, software, and other data where even a small change would cause problems. Lossy compression also reduces file size, but it does so by discarding some data during encoding. The result after decompression is not identical to the original, though it can be visually or audibly very close. This approach works well for media like photos, music, and videos where a small loss in quality is acceptable in exchange for much smaller files. So the statement that best describes the difference is that lossless preserves all original data for exact reconstruction, while lossy discards some data to achieve smaller size.