Is paraphrasing considered plagiarism?

When done correctly, paraphrasing is not plagiarism.

However, if you fail to include a citation or do not adequately alter the original text, this can constitute plagiarism.

For citations, you must include both an in-text citation as well as a complete reference entry according to the requirements of your style guide. Additionally, the words you use should be your own, meaning that the language and sentence structure of the original material must be different.