Topics in Pinker are similar to categories in eBay or filters on Booking.com, with the difference that you can define Pinker topics yourself. Topics can be thought of as collections of keywords that you would typically search for. Topics reflect your choice of what kind of information is important for you to browse and access on a regular basis.
Topic filters allow you to define, and focus on, specific topics and combinations of topics. They are a great way to narrow down your search and be as specific you want when telling Pinker which files you are looking for. Creating, managing, and using your topics as filters is a fast, effective way to logically organise your files.
A topic establishes a context through its collection of keywords, simply because many topic keywords will tend to appear together in a document that covers that topic.
Learn more about Topics