As the name implies, it is a highlighter. It is a free and very easy-to-use tool for anyone. You can highlight any word in the document you wish. You can manage your word lists. For example, you can add words or change the highlight color.

There is also an option to turn it on and off. It allows you to highlight the words in the page, as well as the word that you are typing. It comes with a feature that allows you to mark words that you have already learned. You can manage the number of times each word is present on the page. There is an option to turn the highlighter off.