WordPress is built around two basic concepts. Posts and Pages. Posts are typically blog entries. A series of articles, listed (usually) reverse-chronologically. Pages are used for more static content (i.e. content that doesn’t change or changes infrequently). An ‘About us’ page is an example of a Page on a typical website. In most cases you’ll find that the content in the ‘About us’ page doesn’t change all that frequently.
Now, you might be thinking, “but I don’t need a blog”. This might be true, but you can also use the blog concept if you have a site where you need to display your ‘latest news’ or even just company updates. Basically, any information that gets updated on a semi-regular basis can benefit from the ‘blog’ functionality. Whether that’s a traditional blog, your company’s ‘latest news’ or even just your own personal updates.