When you write a paper, you have to use your own words or else
give credit to the people whose words you're using. If
you don't, that is plagiarizing. That goes for pictures,
too.
"Plagiarism is using another person's words or ideas
without giving credit to the other person. When you use someone
else's words, you must put quotation marks around them and give
the writer or speaker credit by revealing the source in a citation.
Even if you revise or paraphrase the words of someone else or
just use their ideas, you still must give the author credit
in a note. Not giving due credit to the creator of an idea or
writing is very much like lying."
And I got that whole paragraph from Harris, Robert, "Anti-Plagiarism
Strategies for Research Papers," April 8, 2001, Accessed April
10, 2001, http://www.virtualsalt.com/antiplag.htm
(Which is why I put the whole section in quotations).
What is plagiarism?
How students can avoid plagiarism: