R-134A is a type of refrigerant commonly used in air conditioning systems and refrigeration applications. It is a hydrofluorocarbon (HFC) that replaced the older refrigerant R-12, which was harmful to the ozone layer. R-134A is known for its efficiency in heat transfer and lower environmental impact compared to its predecessors. This refrigerant is non-toxic and non-flammable, making it safer for use in various appliances. However, it is a greenhouse gas, contributing to global warming if released into the atmosphere. As a result, there are ongoing efforts to find more environmentally friendly alternatives to R-134A, such as R-1234yf.