Presenting someone else's ideas as your own and/or not giving credit to sources that you use in any project is considered plagiarism. Not only is plagiarism dishonest, it violates LSCS policy.
Understanding Plagiarism and How to Avoid Plagiarizing
Learn what is plagiarism in order to avoid plagiarizing due to being unaware and misunderstanding from this very informative page by Turnitin.com.