meta tags are HTML tags used to provide additional information about a page to search engines and other clients. Clients process the meta tags and ignore those they don't support.

JavaScript is used to create interaction between webpages and the user. CSS: CSS stands for Cascading Style Sheet, it is a style sheet language used to shape the HTML elements that will be displayed in the browsers.

An HTML element is a component of an HTML document that tells a web browser how to structure and interpret a part of the HTML document.