Data that are not in fixed locations. The term refers to free-form text in business documents and reports, news articles and social media. For example, unstructured data are found in word processing files, PDF files, e-mail messages, Internet forums, blogs, Web pages, Twitter feeds and Facebook pages. It is estimated that 80% of all electronic data are unstructured in contrast to highly organized tables in databases. Contrast with structured data. See free-form database and text mining.