It’s a clumping cat litter made from natural bentonite clay. Bentonite is often used in litters because it swells up on contact with moisture, forming firm clumps that are easier to scoop. 
It carries a lavender scent, which is intended to help mask odors and leave the litter area smelling fresher. 
Features & Benefits
Here are the typical features and what they mean:
Feature    What It Means / Why It’s Good
Strong & fast clumping    Moisture (urine) is absorbed and clumps quickly, making removal easier and more efficient. Helps prevent spreading of wet litter and odor. 
High absorbency    Keeps the litter box drier by locking up moisture, which helps reduce odor and bacterial growth. 
Good odor control    Lavender scent helps mask smells; the clumping also helps isolate urine/feces so odors are caught and removed when scooped. 
Low dust / less tracking    Because of bentonite and also due to how it’s processed, the dust is minimal; this helps keep surroundings (and the air) cleaner. Also less dust is better for respiratory health of cats & humans. 
Gentle on paws    Finer or smooth granules, so it’s more comfortable for the cat to walk on. Not harsh or sharp. 
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Size & Packaging
The “20 L” refers to its volume (~20 liters), which is a fairly large pack. This makes it more economical per use compared to smaller sizes. 
Available in different scents (but here we’re specifically talking about the lavender version). 
Things to be Aware Of / Possible Trade-offs
Even though it’s low-dust, no clay litter is totally dust-free. If your cat (or someone in the house) has respiratory sensitivities, you’ll still want to monitor.
The scent (lavender) may bother some cats or people. Some cats don’t like scented litters, or might be sensitive to fragrances.
Clumping bentonite litters are heavier, and the bags are bulky; carrying 20 L of bentonite can be heavy.
It needs regular scooping to maintain odor control, especially with multiple cats or in enclosed spaces.