Signal ProcessingElsevier is an information and analytics company and one of the world's major providers of scientific, technical, and medical information. It was established in 1880 as a publishing company.It is a part of the RELX Group,known until 2015 as Reed Elsevier. Its products include journals such as The Lancet and Cell, the ScienceDirect collection of electronic journals, the Trends and Current Opinion series of journals, the online citation database Scopus, and the ClinicalKey solution for clinicians. Elsevier's products and services include the entire academic research lifecycle, including software and data-management, instruction and assessment tools.