What is plagiarism
Plagiarism is:
“An act of fraud; stealing others work and lying about it afterward”.
From Plagiarism.ORG http://www.plagiarism.org/
You are thus encroaching into another's Intellectual Property. What is intellectual property? It is the "fruit of mental labor; creations of the human mind". [WIPO]
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Avoiding PlagiarismClear examples of ways to avoid plagiarism
Types of Self-plagiarism
Self-plagiarism: re-using one's own work without properly citing/acknowledging previous use.
Stephen Gilliver. Forgive me for repeating myself: Self-plagiarism in the medical literature. European Medical Writers Association 2012; 21(2): 150-3. Adapting from: Miguel Roig. Avoiding plagiarism, self-plagiarism, and other questionable writing practices: a guide to ethical writing. http://ori.hhs.gov/sites/default/files/plagiarism.pdf