In order to build a powerful plagiarism checker, you need to first understand the different types of plagiarism. There are three main types of plagiarism: accidental, deliberate, and sophisticated.
Accidental plagiarism is the most common type and is usually the result of copying and pasting from a website without checking for citations or proper attribution. Deliberate plagiarism is when someone copies someone else’s work intentionally without giving credit. Sophisticated plagiarism is a form of deliberate plagiarism that is often done by experts who know how to hide their tracks. They may use different language or change small details so that their work appears to be original.
To catch all forms of plagiarism, your software must be able to detect both text-based and image-based similarities.