The string you provided is a Google Dork , a specialized search query used to find specific, often unprotected, internet-connected devices. In this case, it targets Axis Network Cameras
hot: This is likely a user-added keyword intended to find "trending" or specific popular feeds, though it is not a standard part of the technical Dork. Purpose and Ethics
People using these dorks can often see live feeds of parking lots, businesses, college campuses, and sometimes even the inside of private homes.
U.S. still No. 1 for unsecured security cameras - CSO Online