There is no set percentage match that determines whether or not your work is plagiarized. A match of 40% may be totally fine, as long as your work is properly presented and cited. A match of just 4%, on the other hand, may suggest that your work is supported by insufficient sources. Plagiarism analysis software can help you identify how much of what you write was copied from others. When you copy material from another source, even if you cite it, you are committing plagiarism. Even if you agree to change some words here and there, or add some details about yourself before you start writing, you are still copying someone else's work. This means that if you plan to publish articles, papers, or books, they will have to be original works that cannot be reproduced or simplified copies of something that already exists. It is important to understand that plagiarism is any form of theft when it comes to ideas or materials. It can be as simple as copying part of a sentence or an entire page of text without acknowledging its author. Copying ideas without giving them credit where it is due violates basic principles of science and engineering. It can also be more complicated than that. For example, if you use information found on websites or in books, you need to include links back to the source pages. This shows readers where they can find the original information for themselves.