A Professional Learning Network, or PLN, means that educators connect with other educators in order to collaborate and learn from each other.  You probably already have a PLN and didn't even realize it.  As a teacher, you are usually working with other staff members within your school or county, sharing ideas and trying different things.  This is considered a PLN.  You may also be a member of Facebook, Pinterest, Twitter, or Instagram, all of which are global communities in which you can find and share a variety of materials in order to grow as a professional.  Professional Learning Networks are important to have as professionals, as we are constantly changing our teaching and growing as educators in order to become better teachers.