This article surveys the form, content, and theology of the Book of Psalms. The Book of Psalms is amongst the Writings in the canon of the Old Testament and has from early times been used as a book of worship and prayer in Jewish and Christian communities. The Psalter contains 150 psalms, and is itself divided into five books with varying numbers of psalms in each, varying also in length and differing greatly in theological content. This article surveys the form, content, and theology of Psalms.