Polyaniline is a conducting polymer widely used in the development of advanced materials due to its electrical conductivity, redox activity, and stability. It is commonly applied in sensors for detecting gases such as ammonia, hydrogen sulfide, and humidity, as its conductivity changes upon exposure. In electronics, polyaniline is utilized in organic light-emitting diodes (OLEDs), flexible devices, and electrochromic displays that change color under electric current. It serves as a corrosion-protective coating for metals, forming stable films in harsh environments like oil and gas industries. In energy storage, it is a key component in supercapacitors and batteries for efficient charge-discharge cycles. Additionally, polyaniline is used in antistatic coatings for textiles and plastics to dissipate static electricity. In biomedical applications, its biocompatibility enables use in drug delivery systems and tissue engineering.