A brain-computer interface (BCI) is a device that allows a person to

control a computer or other device using only their thoughts. 

BCIs are still in their early stages of development,  

but they have the potential to revolutionize the way we interact with technology. 

There are two main types of BCIs: invasive and non-invasive. 

Invasive BCIs are implanted in the brain, while non-invasive 

BCIs use sensors placed on the scalp to measure brain activity. 

Invasive BCIs are more accurate than non-invasive BCIs,  

but they are also more invasive and carry a higher risk of complications. 

Non-invasive BCIs are less accurate than invasive BCIs,  

but they are also less invasive and carry a lower risk of complications.