Plagiarism involves copying and passing off someone else's work as your own without properly citing the original author. This includes copying text, images, videos or other media. Plagiarism is illegal and can result in serious consequences like failing grades, loss of scholarships or licenses, or legal prosecution. It is important to respect copyrights and ask permission to use others' work. Internet etiquette or "netiquette" also involves treating others with respect online and being thoughtful with how you communicate and share information.