Advantages
Drupal is a flexible CMS that allows handling content types including video, text, blog, menu handling, real-time statistics, etc.
Drupal provides a number of templates for developing web applications. There is no need to start from scratch if you are building simple or complicated web applications.
Drupal is easy to manage or create blog or website. It helps to organize, structure, find and reuse content.
Drupal provides some interesting themes and templates which gives your website an attractive look.
Drupal has over 7000 plug-ins to boost your website. Since Drupal is an open source, you can create your own plug-ins.
Disadvantages
Drupal is not a user-friendly interface. It requires advanced knowledge and few basic things about the platform to install and modify.
Drupal is a new content management system. It is not compatible with other software.
Performance is low compared to other CMS. The website which is built using Drupal will generate big server loads and will never open with a slow internet connection.