Key words - a prototype of the article in search engines. These are the words or phrases by which the reader can find your article and determine the subject area of the text. To determine the main key words for an article, it is recommended to imagine what search queries readers can search for your article. Typically, key words can also include basic terminology.
Please note that the clearer and more accurate the keywords are chosen, the easier it is for search engines (including citation databases) to find just your article.