Many businesses wonder, what is the purpose of having a blog? Depending on your stance and marketing objective, blogs (short for web logs) are great open source tools (known as content management systems) that if wielded properly can be instrumental to SEO and organic search engine positioning.
Blogs implement topical pooling of link flow through using a platform of internal linking that makes it crystal clear to search engines what each sub folder is about.
Keep in mind that most sub folders are still viewed by search engines as entirely different sites, so through strategically cross-linking pages or posts from one sub folder to another, the synergy it creates can create spikes of link flow which translate into rankings.
Another great advantage blogs offer to static or legacy (CMS) content management systems that lack SEO prowess is, the ability to ping and promote its own content through RSS feeds and send search engine spiders deeper into a site.