A hollow is a corrupted soul. They're usually made if they aren't crossed over within a certain period of time, or if they're attacked by another hollow while they're just spirits.
A zanpakutou is a representation of your soul in the form of a sword. They have their own abilities. They're a shinigami's prime asset!
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A zanpakutou is a representation of your soul in the form of a sword. They have their own abilities. They're a shinigami's prime asset!