Features of a Web Content Management System:
1) Lets you manage you website content easily with little or no technical knowledge.
2) An updated web content management system keeps up with the current web standards and helps in deploying web pages that conform to the current web standards.
3) Web content management systems provide plugins that help in making the web pages more dynamic with loads of amazing features.
4) The learning curve of today's web content management systems is a smooth curve and it takes just a few hours to familiarize oneself with content management system environment.
5) Web content management systems are available in various languages and almost all the major languages. Therefore one can have a web content management system running in a language of his choice.
6) The security of a website can be enhanced by using CAPTCHA (Completely Automated Public Turing Test to Tell Computers and Humans Apart) and SSL connections. A WCMS has facilities that will include CAPTCHAs to web pages very easily. Thus by using a WCMS, one can increase the security of a web page without having any prior knowledge in creating web pages.

click to enlarge
Disadvantages:
1) With so many web content management systems available, it becomes difficult to decide on which web content management system is suitable for you. It is better to do some research on a few top WCMS before you start using one.
2) Using weak passwords or the default passwords to login to the WCMS that you have installed on the server makes it easy for hackers to gain entry to your website and take advantage of all the content on your website. It is a good practice not to deploy your web content management system on the server on which you have hosted your website. If you plan to deploy your WCMS on the same web server, it is better to use passwords that are difficult to crack.

click to enlarge