Big data is a term used to describe large, complex data sets that cannot be processed by traditional data processing systems. Big data is used in many applications, such as predictive analytics, fraud detection, and personalized marketing. Popular big data platforms include Hadoop, Spark, and Cassandra. Find out more A version control system (VCS) is a software tool that helps developers manage changes to source code over time. VCSs allow developers to track changes, collaborate with others, and revert to previous versions of code. Examples of VCSs include Git and Subversion.