One of the fundamental typographic specifications for laying out paragraphs is determining how they will appear in relation to the left and right margins. Word refers to this specification as alignment. There are four types of paragraph alignment you can set within Word:

• Left-aligned. All lines in the paragraph butt up against the left text margin. No extra spaces are added to the line. The text of each line does not line up with the right margin, so traditional typesetting terminology often refers to left-aligned text as ragged right.
• Center-aligned. All lines in a paragraph are centered between the left and right text margins. No extra spaces are added to the line. The text lines up with neither the left or right margins.
• Right-aligned. All lines in a paragraph butt up against the right text margin. No extra spaces are added to the line. The text of each line does not line up with the left margin, so traditional typesetting terminology often refers to right-aligned text as ragged left.
• Justified. All lines in a paragraph are expanded so they butt up against both the left and right text margins. Space is added, between words and characters, as necessary to fill out the line. In some typesetting references justified text is also referred to as "full justified."

You can change the alignment of any paragraph by using the appropriate tools on the Home tab of the ribbon, on the Formatting toolbar, or by displaying the Paragraph dialog box.