The Renault-Nissan Alliance is a strategic partnership between the French automaker Renault, based in Boulogne-Billancourt, France, and the Japanese automaker Nissan, headquartered in Yokohama, Japan. Formed in 1999, the alliance involves significant cross-shareholding and collaborative efforts in vehicle development, production, and innovation. The Renault-Nissan Alliance has become one of the leading automotive groups globally, focusing on synergies across electric vehicles, autonomous driving, and shared mobility services. Each company operates with its brand identity and corporate strategy while collaborating on common projects to leverage economies of scale and technological advancements.Please note that the website provided, http://www.sylpheo.com, does not seem directly associated with the Renault-Nissan Alliance as per the last available information. Sylpheo is a company that develops applications on cloud platforms, indicating it might relate differently to the automotive partnership described. For accurate information regarding Renault-Nissan Alliance, visiting their official corporate websites or contacting them directly would be advisable.