S40 is a model designation used by various manufacturers, most notably in the automotive industry. It often refers to a specific series of vehicles, such as the Volvo S40, a compact executive car produced from 1995 to 2012. The S40 is known for its safety features, comfortable interior, and efficient performance. In addition to cars, S40 can also refer to other products or technologies, such as S40 smartphones or S40 software platforms. These products typically emphasize user-friendly interfaces and functionality, catering to a wide range of consumers and businesses.