Sheryl Sandberg is an American technology executive, author, and philanthropist. She is best known for her role as the Chief Operating Officer (COO) of Facebook, where she played a significant part in the company's growth and revenue generation. Sandberg is also the author of the bestselling book Lean In, which encourages women to pursue their ambitions and challenges gender inequality in the workplace. In addition to her work at Facebook, Sandberg co-founded LeanIn.org, a nonprofit organization that supports women in achieving their goals. She has been recognized for her leadership and influence in the tech industry and has served on various boards, including that of The Walt Disney Company.