This report provides an overview and analysis of FY2018 appropriations for the Department of Homeland Security (DHS). The primary focus of this report is on Congressional direction and funding provided to DHS through the appropriations process, though note is also made of funding made available to DHS outside this process (e.g., user fees and trust funds). It includes an Appendix with definitions of key budget terms used throughout the suite of Congressional Research Service reports on homeland security appropriations. It also directs the reader to other reports providing context for and additional details regarding specific component appropriations and issues engaged through the FY2018 appropriations process.