Permalinks are customized URL structures you can create to substitute for the machine generated URLs created by WordPress. This allows you to develop aliased URLs that are more reader and search engine friendly. The Permalink Settings group contains the following items:

• Common Settings: provides five different formats to use for URL creation
  • Default: creates no alias
  • Day and Name: creates year, month, and day format with name of post
  • Month and Name: creates year and moth format with name of post
  • Numeric: auto-numbers post and uses number for URL alias format
  • Custom Structure: defined by you, if desired
• Optional Settings: allows creation of custom URL structures for Categories and Tags