Tags are one of several properties that you can attach to your files to help you to find and organize them. In addition to tags, your files include other properties such as Date Modified, Author, and Rating. Tags are not a part of the actual contents of a file. Rather, tags provide information about files that you can use to more efficiently locate and organize them. Unlike other properties, which are usually predefined, tags can be anything you choose (such as "Invoices," "Vacation," or "Personal Documents"), and once created and attached to a file, become one of the file's properties.
You can use tags and other properties to further refine the way you search and organize. So, the next time you need to locate a file, try searching by using tags you have applied to files, which can be easier than trying to remember the folder where the file is stored and the correct file name.