Justified text expands the space between words to span the complete line, aligning it with the left and right borders. In the paragraph dialog box, you may also adjust the alignment and justification settings. These properties are useful for setting the left margin for titles or chapters.
The main use for aligned text is to create uniformity in your document's looks. For example, if you want all of your chapter headings to be centered, they can be done easily by selecting them and using the Align Text tool on the Paragraphs tab. The "Center" option in the drop-down menu will put each one into center position.
You might also want to set the alignment for all paragraphs in a section at once. To do this, select the Section Break button in the Paragraph Group on the Home tab. This will pop up a menu where you can choose different options for every paragraph in the selected section. Choose Align Left from the menu to make all paragraphs in that section start on the left side of the page.
Alignment is also useful for making sure that columns and rows of information are kept equal in size. For example, if you were designing a brochure with four square boxes on it, you would want them to all have the same width so they look like the same object even though they're not actually drawn together.
The gap between words is controlled by justification. This leaves no room for any padding or margin in between.
There are two types of horizontal alignment: left-aligned and right-aligned. Left-aligned texts start on the left side of the box and wrap around to the right. Right-aligned texts start on the right side of the box and wrap around to the left.
Examples of left-aligned text include article headlines, notes from teachers, and text within web pages. Text within documents that should be evenly distributed across multiple lines (such as reference lists) is best left untouched and left justified.
Examples of right-aligned text include columns in tables and web page footers. Characters within these forms of media will not wrap around the screen; instead, they stay on one line until there's enough space for them to wrap next to another character.
In general, left-aligned boxes make reading easier because the eye can travel the entire length of the line without having to scroll back up to read more of the text. Right-aligned boxes require scrolling back and forth which is harder to do while reading.
Text that is justified The gap between words is controlled by justification. This type of text is most commonly found in newspapers and magazines.
Text that is ragged The gap between words does not expand to fill the line. It leaves a bit of a margin on both the left and right sides. This type of text is most common in books and documents written by hand. It provides more space between lines of text and between words within lines.
Text that is center-aligned The gap between words is centered on the line. It will usually cover the entire width of the page if there's enough room.
Text that is left-aligned The gap between words is aligned with the left border of the line. It will usually not fit completely into a column unless the text is very wide.
Text that is right-aligned The gap between words is aligned with the right border of the line. It will usually not fit completely into a column unless the text is very long.
Text that is full-width (or full-height) Aligned with the left and right margins so that it uses up all available space.
Justified text is spaced so that the text block's left and right sides have a tidy edge. Left-aligned text, which has a straight left line and an irregular right edge, is the most common alternative to justified text. When compared to left-aligned text, justification creates a cleaner, more professional appearance. Justification can be used on any text level: headings, paragraphs, lists, and tables are all able to use this formatting option.
In terms of readability, it makes no difference whether you justify text or not. At least with modern fonts, characters are wide enough that they don't need to be stretched out to fill the width of the line. But for aesthetics reasons, many typesetters still choose to leave some text unformatted (i.e., not justified) even if it doesn't impact readability.
When typing text, you should use the "Text Alignment" command from the "Format" menu or press the "T" key twice. This applies to both Word and Excel.