Document properties, also known as metadata, are details about a file that describe or identify it. Document properties include details such as title, author name, subject, and keywords that identify the document's topic or contents.
Types of File Properties:
By default, Microsoft Office documents are associated with a set of standard properties, such as author, title, and subject. You can specify your own text values for these properties to make it easier to organize and identify your documents. For example, in Word, you can use the Keywords property to add the keyword customers to your sales files. You can then search for all sales files with that keyword.
Automatically updated properties:
These properties include both file system properties (for example, file size or the dates when a file was created or last changed) and statistics that are maintained for you by Office programs (for example, the number of words or characters in a document). You cannot specify or change the automatically updated properties.
Custom properties :
You can define additional custom properties for your Office documents. You can assign a text, time, or numeric value to custom properties, and you can also assign them the values yes or no. You can choose from a list of suggested names or define your own.
Properties for your organization :
If your organization customized the Document Information Panel, the document properties that are associated with your document may be specific to your organization.
Document library properties :
These are properties that are associated with documents in a document library on a Web site or in a public folder. When you create a new document library, you can define one or more document library properties and set rules on their values. When you add documents to the document library, you are prompted to include the values for any properties that are required, or to update any properties that are incorrect. For example, a document library that collects product ideas can prompt the person for properties such as Submitted By, Date, Category, and Description. When you open a document from a document library in Word 2010, Excel 2010, or PowerPoint 2010, you can edit and update these document library properties in the Document Information Panel.