A “website” is broadly defined as a collection of “pages” that can be accessed online through the internet. But the distinction between what makes up a “website” and what constitutes a “blog” has over the years become more and more blurred. That is because of the proliferation of “blogs” as part of an effective online presence. More and more websites are now a combination of “web pages” and “blogs” and these pages and blogs are tied seamlessly to other social media platforms. Which means blogs and pages are not necessarily mutually exclusive but rather are part of the same overall strategy.
So perhaps the question is more accurately stated as what is the difference between a “web page” and a blog” within the context of an effective website.
Let’s first put a definition on the the term “blog”. Here is one that I think fits well –
“The word “blog,” a contraction of “web log,” is an informational web page that consists of discrete units called “posts.” The term “log” comes from the history of nautical navigation and originally referred to a record of chronological events kept by a ship’s crew. Like a ship’s log, blogs on the web tend to maintain an ordered chronology, although they often unfold in reverse order. Blog posts are often shorter and less formal than other types of writing. Blogs can be personal, artistic, academic, or professional. It is a unique form of online publishing that creates opportunities for producing knowledge, sharing research, building social networks, developing professionally, or documenting personal growth.”
Source: Duke University – Thompson Writing Program.
Blogs are actually a series of web logs where the content is stored in a chronological fashion (much like a diary). New content is generally seen as more relevant and goes on top of the existing pile of material (like a stack) while older ones are archived and pushed further down.
On the other hand I think the term that is most associated with “web pages” is “static”. While it is recommended that content on “web pages” be reviewed on a regular basis for accuracy it is still likely that the information contained on any given web page would not require regular updates. The other distinction is that “web pages” are generally hierarchically connected. The structure of the pages are organized more like a tree structure with branches from the same root. A website does not necessarily prioritize based on the creation date of a page but rather it is up to the website developer to decide how to link all the pages with each other.
The question is not necessarily one of either/or but more of balance. What combination of web pages and blogs make up the best web presence for your organization.