Academic institutions have a mission to transmit knowledge by respecting the authors who share their knowledge. When assessing papers, teachers ensure that this is done to validate academic integrity.
Plagiarism has no place in the examinations and diplomas of our institutions. Plagiarism can be hidden in a paraphrase, the translation of a passage, a poorly referenced bibliography, or a failure to respect citation standards...
To check if a document contains "duplicate content", you can copy and paste sentence by sentence, putting it in inverted commas in a search engine such as Google or Bing. Then, you look to find out if there is a similarity between the words of the student and an open access resource on the net. This process is time-consuming for a dissertation or thesis. There is no pedagogy or support in this approach.
That is why teachers use similarity detection software.
This way, they save time in the correction. They obtain certification of the originality of a research work with serious data provided by the plagiarism detection software. And finally, teachers are supported and trained in the respect of copyright and intellectual property.