2 (or maybe more) questions

Hey guys, I would like to ask 2 questions regarding things people talk about here.
What is "duping"? Is it when you get a duplicate character and that character's signature ability gets awakened/ranked up? Why do people talk about it as if you can grind it?
How do you gain "shards" from duping?
What is "duping"? Is it when you get a duplicate character and that character's signature ability gets awakened/ranked up? Why do people talk about it as if you can grind it?
How do you gain "shards" from duping?
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Comments
When people talk about grinding they mean in the arena. You can win a champ if you score high enough. The feature champs will give a full dupe but the basic only unlocks the signature ability...1 signature level instead of a full dupe.
Depending on the star rating you get shards for the dupe. A 3* gives 4* shards and a 4* gives 5* shards.
Thank you so much for the answer, you have been of great help to me