What are the tiny led lights near the CCTV cameras represent?

The term IR LED, or simply infrared LED, refers to those tiny led lights that surround the CCTV cameras. They are used to provide lighting so that security cameras, which are off during the day, can view in low light and the dark. Through those tiny led lights, cameras can use infrared to take pictures at night.

The spectrum of light that is invisible to the unaided human eye includes infrared light. However, surveillance cameras can see it. In fact, the LED emitters are producing infrared light. This implies that your security camera can see what's happening at night, even when it's absolutely dark and you can't see anything. You may have observed this when your security camera goes from day to night vision; you can hear a slight clicking sound as the infrared illumination turns on.