What is Brain Computer Interface? How BCI works?

Hi viewers, few days back Mr. Elon Musk tweeter post announced that a chip has been installed in human brain. When we checked that technology, found that it is a huge step towards Humanity.
We found revolutionizing healthcare for particularly those who are paralyzed, and other disable people, also announced that next step would be Brain-to-Brain communication.
Got extremely excited, but with all precautions still this technology raised few concerns, IF IF IF this Data (even 0.01%) got manipulated/hacked???????
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