Data virtualization integrates data from disparate sources without copying or moving the data, thus giving users a single virtual layer that spans multiple applications, formats, and physical locations. This means faster, easier access to data.
In the modern era, enterprise data comes in many forms and is stored in many locations. There is both structured and unstructured data, including rows and columns of data in a traditional database, and data in formats like logs, email, and social media content. Big Data in its many forms is stored in databases, log files, CRM, SaaS, and other apps.
https://www.datamation.com/big-data/what-is-data-virtualization.html
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