The full text of an article is the entire article, not just a snippet or summary.
Identifying the full text isn't always straightforward. For example, the following two resources are both very short in length. However, the first one is a full text article, while the second example is an abstract, or summary, of an article. Be aware of the type of source that you are reading.
Example 1: Full Text of an Article
Example 2: Abstract of an Article
From: Forfert, Nadège, et al. "Parasites And Pathogens Of The Honeybee (Apis Mellifera) And Their Influence On Inter-Colonial Transmission." Plos ONE 10.10 (2015): 1-14. Academic Search Premier. Web. 16 Nov. 2015.