There is no definitive answer to this question as it depends on how the blog is defined. Generally, a blog is a web site where people can post short, informal pieces of writing.
These can be about anything, and they can be shared with others using the blog’s social media channels.
Some people might consider a blog to be an article in the sense that it is an extended, formal work that is designed to provide information or ideas. However, others might see a blog as being more informal and interactive, akin to a journal.
Ultimately, it depends on how the blog is used and what people consider to be its defining characteristics.