I'd like to share a specific card with a user (who has a Trello account within the same company) without giving them visibility to my whole board. Is that possible?
Hi @Kelly welcome to the community :) short answer: no, if you invite someone to a board, they'll have access to all contents on the board. It's not possible to restrict access to one or a subset of cards within that board.
An alternative is to mirror the card to another board that they have access to. Here's a bit of information about mirroring cards: https://support.atlassian.com/trello/docs/mirroring-cards/
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