You use update queries in Access databases to add, change, or delete the information in an existing record. You can think of update queries as a powerful form of the Find and Replace dialog box. You cannot use an update query to add new records to a database, or to delete records from a database. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.