Sanofi is a global biopharmaceutical company that researches, develops, manufactures, and commercializes medicines, vaccines, and medical devices across multiple therapeutic areas including immunology, rare diseases, neurology, oncology, and vaccines. The company serves patients and healthcare systems worldwide, with a diversified portfolio of small-molecule drugs and biological therapeutics, and generates revenue primarily through pharmaceutical and vaccine sales across key markets including the United States, European Union, China, and other regions. Commercial success depends on navigating complex regulatory approvals, pricing and reimbursement negotiations with government and private payers, market access challenges, and competition from generic and biosimilar alternatives, while managing substantial research and development investments and post-marketing surveillance obligations across its operating jurisdictions.