Solar cells, mirrors
Regulation bars in nuclear reactors
Research of blood and lungs

The major application of indium is in automobile bearings to improve moisture resistance and antiseizure properties. It is also used in the semiconductor industry. In this application, indium acts as a doping agent in the formation of p-type germanium. Examples are transistors, diodes and rectifiers

The most important indium alloys are indium-tin, lead-indium-silver and copper-silver-indium, all used as solders.

Indium is also used in plating applications due to its electrolytic properties, and in the production of electroluminescent panels, as an oxide.