The most basic similarity between primary & secondary sources is "They both Convey Information","Neither is an Absolute Objective Source" and in some special situation, a single source can be both at the same time.
Now, Difference is that, Secondary sources analyzes, interprets and explains primary sources, while they are independent and doesn't include any picture, articles, tools etc. which secondary sources do
<span>A primary source refers to documentation or material presented by parties that were directly present or involved in the referred subject, while a secondary source refers to documentation derived from the opinion or views of primary sources.</span>
