It allows Internet pages to be given specific functions. For example, JavaScript can be used to check if forms have been fully completed, to open small windows (pop-ups) or to optimise page navigation. The use of JavaScript allows users to change an Internet page by entering data with the mouse or keyboard (for example with a so-called mouseover). It also makes it possible to create dynamic menus for user-friendly navigation. JavaScript turns Internet pages into interactive applications, which can then be used for educational purposes.