As others have said, Wikipedia is a tertiary source. A primary source is the original materials, e.g. research papers for example. Secondary sources analyze or summarize, but also connect the primary sources into a bigger work. This is how comprehensive textbooks that cover a wide breadth of topics are written. Wikipedia is for those who are too lazy for even the secondary sources. I.e. blog post sized articles about a particular topic. That's what a tertiary source is and nobody really needs tertiary sources other than for convenience and time savings.