For many businesses and individuals, a website's primary function is often brand positioning - quickly letting visitors know that they've found the right site, with details about who/what the business is, what it does, who for, typical price points, USP and so on.
This type of website – a small, online digital brochure - is made up of words and pictures that are well suited to be published using a content managment system, a self-hosted open source tool like Wordpress, or a subscription-based software system like Squarespace.
The more DIY option of Installing and hosting open source software can reduce costs. However, a certain level of technical accumen is required to get things working, and to make things secure. (Try a search for "wordpress data leaks"). Cheaper in cash terms, but with a significant time and effort overhead.
Hosted SaaS options like Squarespace allow you to avoid any server set-up, and the technical know-how required is more todo with HTML and learning how to use the system you choose. This option can be faster and simpler, but will usually cost more.
Typomania CMS is a hosted software solution - more like the Squarespace option, but with a mentoring attitde to customer support. I usually do the initial set-up myself and then hand a fully working system over to each customer so that they can make content changes whenever they like and with no additional charges.