Block weight
Bitcoin’s consensus measure of block capacity, introduced by SegWit.
In more detail
Weight counts different parts of a transaction differently, which is why a byte count alone doesn't tell you its fee-relevant size. Wallets commonly express size in virtual bytes derived from weight and quote fees in sats per virtual byte. That helps compare transactions with different input and witness structures.
How you might use it
Your wallet quotes 8 sats per virtual byte. Its estimate uses the transaction's weight-based size, not simply the raw file's byte count.
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