Can you explain to me what "Styles" represents, and how it can be used?

I can't, but the internet can. Go http://www.w3schools.com/css/default.asp">HERE to get started. It is a basic introduction to CSS (Cascading Style Sheets) which is the current standard method of applying "styles" to the content of web pages.

Here's an excerpt from Wikipedia's page on CSS:

"Cascading Style Sheets (CSS) is a style sheet language used for describing the presentation semantics (the look and formatting) of a document written in a markup language. Its most common application is to style web pages written in HTML and XHTML, but the language can also be applied to any kind of XML document, including plain XML, SVG and XUL.

CSS is designed primarily to enable the separation of document content (written in HTML or a similar markup language) from document presentation, including elements such as the layout, colors, and fonts.[1] This separation can improve content accessibility, provide more flexibility and control in the specification of presentation characteristics, enable multiple pages to share formatting, and reduce complexity and repetition in the structural content (such as by allowing for tableless web design)."

Here's a link to the full article: CSS