What is the purpose of the 'text-align' property in CSS?

The 'text-align' property in CSS is specifically designed to define how text is positioned within an element. This property allows developers to align text in various ways, such as to the left, right, center, or justify it. When you use 'text-align' in your CSS rules, it directly impacts how the content appears visually on the webpage, providing control over the layout and enhancing readability.

In contrast, the other choices describe properties that serve different functions. Controlling the font size is accomplished through the 'font-size' property, which determines the size of the text. Setting the color of the text is done using the 'color' property, allowing you to change how the text is perceived visually through color. Adjusting line height involves the 'line-height' property, which affects the space between lines of text. Each of these properties serves a unique purpose, but 'text-align' is specifically intended for alignment and layout of text within its container.