Are these business use only or can I use one personally?
You can definitely use it personally!
What is meant by business is that it’s made to be more durable – back and forth from offices, client sites, traveling, etc. – and the operating system is Windows Pro which allows connecting to domain environments. Additionally , business class laptops will often have other management features that are helpful for IT departments.
(Note that I am not staff. I just volunteer to help out on the forums.)