HTML, an initialism of HyperText Markup Language, is the predominant markup language for web pages. It provides a means to describe the structure of text-based information in a document — by denoting certain text as links, headings, paragraphs, lists, and so on — and to supplement that text with interactive forms, embedded images, and other objects. HTML is written in the form of tags, which give commands regarding appearance, (for example, bold), position (right, left, or centered), color, and so forth.
It is a very flexible language, and there are many free programs for both MAC and PC which can help you get started building webpages quickly and easily.
Some of these HTML programs are WYSIWYG, (pronounced Wiz-e-wig) which stands for What You See Is What You Get, in other words, you just type, or cut and paste, and the program does the work for you.
Other programs require that you know basic HTML language. Still others will allow you to preview what the live page will look like but then access a second window to be able to tweak the code.