See this answer:
It has got a +25 bounty from the community, which looks like this:
It says in the tooltip on the red box with +25:
This answer has been awarded bounty worth 25 reputation by Community
What is this? How is it awarded?
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1 Answer
see
https://softwareengineering.stackexchange.com/faq#bounty
specifically
If you do not award your bounty within 7 days, the highest voted answer created after the bounty started with at least 2 upvotes will be awarded half the bounty amount.
