Drupal Multisite Installation - more than one way to implement. PART I

Drupal is a great Open Source CMS. Whether you are currently evaluating CMS solutions, have already chosen Drupal or are currently using Drupal
this white paper will help you understand Drupal Multisite Installation for medium or large Drupal sites.
At WebeeStudio, we are frequently asked if Drupal will allow management of multilingual or multi-regional sites. The simple answer is yes. A detailed answer is more complex because there is more than one way to implement, and the method you use will depend on the site’s particular needs. The intent of this white paper is to describe the options for managing multiple affiliate sites.
We will analyze the most popular design options, describing the pros and cons of each one and evaluating when to use one over another. (In a future blog article we will explain the options available for managing multiple languages sites using Drupal.)
In this white paper we will evaluate the following design options for managing multiple sites:
  1. Different Drupal installations, multiple databases
  2. Multiple sites in one Drupal installation, multiple databases
  3. Multiple sites in one Drupal installation, multiple databases with some shared tables
  4. Multiple sites in one Drupal installation, using Domain module, one database