Kinda depends on what you do at the university. For instance if you are a professor, you might blog about your specific subject. If you’re a tech-support person like me, most likely you will blog about support topics, university technology, and so forth.
WordPress sites have regular web pages, and for those who choose to use it, a Blog feature.
For those just tuning in to the Internet, “Blog” is short for “Web Log”, and is a public journal-writing tool that became popular in the early 2000’s. If you are accustomed to the frenetic, fragmented, fractured world of social media, blogging is a more long-form, stable method of putting sequential information on the web.