If you're a Raspberry Pi fan, perhaps you'll appreciate this little bit of history: the Camera Module was its first-ever accessory. With it, you can make security cameras and have all sorts of fun.
Raspberry Pi enthusiasts creating projects that need more than one camera connected to the mini PC may be interested in the Arducam Multi Camera Adapter Module V2.2 for Raspberry Pi 4 B, 3B+, Pi 3, Pi ...