Drupal was designed for community-based websites and has strong user role and access control functionality. You can create as many custom user roles with custom access levels as you need. For example you could create the following roles, each with different levels of access to your features: "anonymous visitor", "authenticated user", "moderator", "editor", "webmaster", "admin".
Drupal's core functionality can be further extended by using various community developed modules. This allows us to minimize the development time, resulting in a very cost-efficient end result.
Unlike many other CMS's, Drupal gives you precise control over URL structure, which makes it ideal for Search Engine Optimization. Each item of content in Drupal (called a node) can be given a custom URL (called a URL alias). Drupal uses Apache's mod_rewrite to enable customizable URLs that are both user and search engine friendly.
All content in Drupal is fully indexed and searchable at all times if you take advantage of the built in search module. This feature is great when used to find archived items, or content in general on a very content-heavy website.
Drupal can be configured to save any revisions done to the website, allowing the users to revert to an older version of the page at any given time.
Drupal's Page Title Module gives you custom control of your HTML "Title" elements, while the Meta Tags Module gives you control over your pages' individual meta description tags. This is an excellent feature to make your website more search engine optimized.
In most cases this is what the back-end control panel looks like. It is placed at the top of the screen, allowing for an un-obstractive and easy access to all the tools you need without leaving your website interface. Having said that, it can be completely customized according to your company's needs.