Although most American children are raised in a faith tradition, by the time they reach their early twenties their outward religious expression declines significantly, with many leaving the faith in which they were raised in favor of another faith or none at all, though many still claim that religion and spirituality are important. Reasons for this change in religious behavior include adolescents' forging their own identities, increased immersion in contexts beyond the family, and exposure to media. As emerging adults encounter events such as attending university, breaking up with a romantic partner, and traveling, they are likely to make sense out of them, a process known as meaning-making. Thus, coming into one's own takes on great prominence during the years of emerging adulthood (18-29), making it ripe for religious and spiritual development. Emerging Adults' Religiousness and Spirituality seeks to understand how the developmental process of meaning-making encompasses American emerging adults' religiousness and spirituality. This volume does not focus on disentangling religion and spirituality conceptually, but rather emphasizes their centrality in the psychology of human development. It highlights the range of experiences and perspectives of emerging adults in the U.S. grounded in social context, social position, and religious or spiritual identification. Chapters are written by an interdisciplinary group of authors and explore topics such as the benefits and detriments of religiousness and spirituality to emerging adults; contexts and socializing agents such as parents and peers, the media, religious communities, and universities; and variations of religiousness and spirituality concerning gender, sexuality, culture, and social position. Using a developmental lens and focusing on a significant period within the lifespan, this volume embodies the key aspects of a developmental perspective by highlighting specific domains of development while considering themes of continuity and discontinuity across the lifespan.