An authentic text is a written or spoken text produced to be read/heard by proficient language users and not altered in any way to aid language learning. An authentic text is unchanged for learning, preserving its features of genre, style, layout, discourse. In the 1980s and 1990’s it was considered very important in the communicative approach to only use authentic texts as they represented what learners needed to cope with in real life and provided them with exposure to genuine language features.
"I generally prefer using authentic texts with my learners as they think they are real and interesting. But sometimes the texts are quite difficult as they aren’t adapted at all for language learning."
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Porter D & Roberts, J (1980) Authentic listening activities. ELT Journal 36/1. Oxford University Press.