There are a lot of differences between guest posting & a private blog network. Here’s how I define these:
- Private Blog Network (PBN): It is one of the black hat Search Engine Optimization technique in which a blog owner buys high DA expired domains, generally around 20, to increase backlinks by creating separate websites on each expired domain and linking them to the main domain which is the actual blog or website. This is a risky and wrong method to gain backlinks because Google has realized this and it is penalizing detected sites.
- Guest Posting: This is one of the fair methods to increase backlinks by contributing to popular blogs in your industry. Basically, you have to write and publish articles also known as posts on sites which you do not own. You are publishing articles on someone else’s website and in return, they are either providing you money or backlinks. Otherwise, I don’t recommend doing it for free