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HTML is a relatively simple programming language that, at its core, consists of elements. These elements allow you to distinguish different sections of text as different aspects on your page. Whether it be a paragraph, a heading, a column, or whatever you need it to be—this is accomplished with the use of these elements.
This language is also where you get the ability to create hyperlinks. The use of hyperlinks is very important, especially when you want to be able to direct someone to a specific part of your text or page.
CSS is a programming language that is used to style and structure the layout of a web page. If you want to change your font, color, and background, you may do so by adding an animation or design a specific outline. This is the language you're going to make use of to accomplish those things.
CSS makes use of the box model—most elements are represented as a box with the content, padding, and borders built-up like layers on an onion. You need to understand the box model before you can begin to understand how to create CSS layouts.
Meanwhile, SQL is a programming language that is designed to work with sets of facts and how they relate to each other. As you might expect, relational database programs make use of SQL. Like many other computer languages, SQL is, in fact, an international standard. However, SQL is easily read and understood even by beginners.
Data sets are described in SQL using SELECT statements. An SQL statement is like a sentence and consists of clauses. Some clauses are required in a SELECT statement.