Entropy
A measure of uncertainty that helps describe how unpredictable a cryptographic secret is.
In more detail
For wallet keys, the useful question is how difficult they are to guess, not how impressive they look. Secure random generation supplies unpredictability. A long phrase chosen from familiar words by a person can be easier to predict than its length suggests, so length and effective entropy differ.
How you might use it
My favorite quote has plenty of characters, but the wallet generates key material from secure randomness instead of my predictable taste.
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