A content management system is computer software that allows the user/or a company to easily build, modify and create digital content. Content management systems are used mostly to build and manage websites, but they are also used for blogs and other digital content.

The benefits of HTML are that you can build the website exactly to your liking rather than using a template and HTML is more secure.  A drawback to HTML is that is more time-consuming than CMS, additionally, if the website has many contributors, they might not all know HTML, and CMS format may be the better option. The benefit of CMS is that is more user-friendly, and you can log in to the admin from any computer. CMS be launched more quickly, and it offers templates and plugins. However, CMS isn’t as secure and it doesn’t allow for as much customization as HTML. If the person or the company is able to hire a professional web designer, it would benefit them because a custom web design from a talented web designer stands out and goes above and beyond a CMS website. The CMS websites are built with pre-sets and templates whereas the HTML is built with more creative freedom and with additional detail that the CMS site doesn’t offer.

CMS has impacted the web design profession because rather than hiring a web designer, it has become common for companies and individuals to use CMS instead because of its ease of use.

https://www.coredna.com/blogs/cms-vs-html