What is CMS? How does it differ from “building from scratch”?

Since the majority of components that make up a website or web application have similar functionality, Content Management Systems (CMS) were created. They contain “ready-made” and “templated” solutions that allow for the construction of a website with minimal modifications in the shortest possible time. In addition to ease of development and cost-effectiveness, CMS solutions offer advantages such as stability, scalability, security, a wealth of features, and more.