What does it mean for a device to be hardwired?


Recently while reading about security cameras in Shadowrun 5e, I came across a forum post where someone suggested that if you don’t want a decker to be able to disable your security cameras, you can hardwire them. From what I understand this means that they are not connected to the matrix, but what is less clear is whether that’s all, which leads me to my question: What does it mean for a device to be hardwired in Shadowrun 5e?