LeanIn.org is a nonprofit organization founded by Sheryl Sandberg, the former COO of Facebook, in 2013. Its mission is to empower women to achieve their goals and create a more equal world. The organization provides resources, community support, and educational materials to help women navigate challenges in their personal and professional lives. The platform encourages women to "lean in" to their ambitions and offers tools for leadership development, mentorship, and networking. Through initiatives like Lean In Circles, small groups of women come together to share experiences and support each other in their journeys toward success.