There is a vast array of cameras available today. They fall into two broad categories. Stand-alone cameras are battery or mains-powered and usually send images via WiFi or the cellphone network to a phone app and/or the cloud. They typically have a storage card inside the camera. Hard-wired camera systems (known as CCTV), where the cameras are connected to a security video recorder somewhere on the premises. The recorder includes storage big enough to store video from several cameras and can be connected to the internet to report to apps, the cloud, and 24/7 monitoring stations.