Authentic Material
There are many references to authentic material in the ELT literature. Books and journals contain thorough explanations of why it should or should not be included in lessons, and how it is to be used or best exploited. But those authors who support the use of authentic material have in common one idea: "exposure". In other words, the benefit students get from being exposed to the language in authentic materials.
Differentiation of the terms “authentic" and "genuine material" has been a seminal one in the field so I should like to mention it here: Authentic would be material designed for native speakers of English used in the classroom in a way similar to the one it was designed for. For example, a radio news report brought into the class so students discuss the report on pollution in the city where learners live.
Most of the time, though, this material is used in a genuine way, in other words, not in the way it was intended, but in a somewhat artificial way. For example, news article where the paragraphs are cut up and jumbled so students have to put them back together in the correct order.

Non- authentic material
Autopens can be tough to identify, because they look so real. I caught this signature because it matches an example in a reference book in my autograph library on autopens. This signature looks a little wobbly on the arc of the "B". The line is thick and fairly uniform from beginning to end. Real signatures look a bit sloppier.