5.7 Save Documents

     After creating a new document, you save it to a location and assign it a name. When you subsequently change the document, you need to save the changes. If an application quits before you save changes, you may lose all the changes you have made, so you should get in the habit of saving documents frequently. OS X supports versioning of documents, which means you can save multiple versions of a document in the same file and return to earlier versions as needed. But only some applications support versioning; not all applications that run on OS X do.