[development] Is there a Drupal API Chart or Map that one can refer to?

In order to work with the Drupal API, is there a Drupal API Chart or Map that one can refer to? Regards ----------------------- Fouad -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.394 / Virus Database: 268.10.4/399 - Release Date: 7/25/2006