Like anything else, Drupal and Acquia have their own terms and concepts that might be unfamiliar to you if you're new to either. We've put together this glossary of terms (including a brief definition for each) and links to additional information about each item.
|Block||A container for site information that is placed in regions for display on your website|
|Content||The information that you want to provide to your website's visitors|
|Content type||A structured data type that defines how content is added to a website and displayed|
|Docroot||The root level of your Drupal installation and its websites, which contains its files and directories|
|Distribution||A packaged set of files that include Drupal core along with a set of themes and modules selected to address a particular need|
|Environment||The section of server and application stack a web application exists within.|
|Install||The process of creating a Drupal website, or the collection of files and code that make up a website|
|Multisite||A group of sites contained within a single docroot|
|Module||An extension or plugin that adds functionality to your Drupal website|
|Permission||Individual ability (relating to website access or administrative access) that can be provided to users|
|Region||An area defined by a theme into which you can place a block of content|
|Role||A collection of permissions that can be applied to a group of website users with similar requirements|
|Theme||Files and settings that determine the visual style of a Drupal website|
|Tier||A description of your server architecture or subscription|
The Glossary page on drupal.org also contains information about these and other Drupal terms.