What is plagiarism, How to check plagiarism, Is there subscription with any plagiarism?

checking authority like turnitin? Is there any writing guidelines of a research?

In the simplest terms, plagiarism is copying the words or ideas of others without giving them credit (that is, presenting someone else's work as your own).   It is cheating, and it is theft.

The best way to avoid plagiarism is to be mindful about your sources during the research and writing process:

• Carefully keep track of your research before you write.  A research journal and citation management tool can be a big help.
   
• Make sure you paraphrase or quote your sources correctly as you write.
   
• Double-check that you've correctly cited all of your sources after you write.  (Use your style guide!)

• Use Plagiarism checker software to check whether it is okay or not.