It is a search engine for internet-connected devices that allows users to find devices that are connected to the internet and see information about them, such as their IP address, device type, operating system, and open ports. Some examples of devices that can be found using Shodan include webcams, routers, servers, traffic lights, and smart TVs. Some people use Shodan to find security vulnerabilities in devices or to find specific types of devices for research purposes. Others use it for more nefarious purposes, such as locating and accessing unsecured devices.