Family planning is one of the most cost-effective ways to reduce maternal, infant and child mortality and contributes to the empowerment of women and families, as well as to the expansion of opportunities for economic development. In recent decades, there have been tremendous improvements in the reproductive health of women in low- and middle-income countries (LMICs) and dramatic increases in use of modern contraception. As of 2019, more than half of the 1.6 billion women of reproductive age (15–49 years) living in LMICs want to avoid a pregnancy so the need for contraception is great. Globally, approximately 257 million women had an unmet need for modern contraception—that is, they want to avoid a pregnancy but were not using a modern method. Almost half of pregnancies in LMICs—111 million annually—are unintended, with over 75% occurring among women who want to avoid a pregnancy but are not using modern contraceptives.