Q. What is the difference between PDF and HTML?
When accessing full text articles you may have the choice between PDF or HTML documents. Both contain the same text of the article.
A PDF is a picture of the print copy of the article. This format works well when you are printing the article or want to see graphs or images in the article. PDFs include the page numbers, so are easier to cite in your bibliography or cited works page. You need Adobe Acrobat Reader to access the article.
An HTML document has been formatted for the computer. This format works well when you are reading the article online. The article may contain links to other parts of the document. Graphs or images may or may not be accessible. You do not need special software to read the article.