R-133A, also known as 1,1,1-trifluoroethane, is a colorless, odorless refrigerant and solvent. It belongs to the hydrofluorocarbon (HFC) family and is used primarily as a refrigerant in various cooling applications. R-133A has a low global warming potential compared to some other refrigerants, making it a more environmentally friendly option. However, its use is regulated in many regions due to concerns about ozone depletion and climate change.