What is the most important quality of lossless compression?

The most important quality of lossless compression is that there is no data loss.

Lossless compression is the use of data compression algorithms or techniques to compress an original data to a compressed data with no data loss in the compression process.

Hence, the contents of the compressed data is identical to the original data, therefore the original data to can be reconstructed from the compressed data.

We can conclude that there should be no loss of data during lossless compression.

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Explanation:

When a file is being compressed from it original form to a compressed form, it's important that the text retains its unique form or at the very least, it should be similar to its original form

This is so because a little drop in quality can cause distortion to the text and thereby changing its meaning or making it unreadable.