Keyword Stuffing is the Black Hat search engine optimisation technique which is used to improve the search engine rankings of a website/blog on the targeted keywords. This practice was generally used to show a web page as the most relevant source of information on a particular keyword or search term. This black Hat SEO technique is mostly used in the areas of Meta Tags or in the content section of web pages to target key terms.
It’s always advised to avoid the practice of keyword stuffing because it is truly considered as spam and many of the search engines, especially Google which occupied 70% of the Desktop Search Engine Market Share can penalize your entire website if found keyword stuffing practices on any web page.
Above image shows an example of Keyword Stuffing for the keyword “Best Laptops” used in the content of a web page.