The three main types of data classification are:
Content-based classification: identifies sensitive information by inspecting and interpreting files and documents;
Context-based classification: looks at indirect indicators of sensitive information such as the application that created the file, the person who created the document, or the location in which files were authored or modified;
User-based classification: relies on user knowledge and involves a manual, end-user selection of each file (when the document is created, after a significant edit, or before the document is released).
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