One or both ends of the alignment
The so-called two alignment means that both the left and right sides are aligned at the same time.
The text in your Word document should have at least two rows or more, so that you can find the effect of the justification.
Once justified, the text of each line in the paragraph (to see the effect in full rows), the text of the lines on the left is aligned vertically, and there are no lines of characters that are not aligned. At the same time, on the right side, the text of each line is equally aligned in the vertical direction.
This is the effect of the alignment, the left and right sides, each line of text in the vertical direction, aligned to a line.
Word uses this alignment by default, so that the text in each paragraph of your document is aligned on both the left and right sides. Especially in the typesetting of English, the effect is more obvious.
If you do not use justified alignment, but use the left alignment, then, the document lines on the right side, is not aligned, you can try to see the effect of the understanding. Similarly, if you use right alignment, the lines of the document, on the left side, are equally not aligned, and more or less, there are some rows and other rows, there will be one or half character gaps, always not on a vertical line alignment.
Second, decentralized alignment
Distributed alignment, which is aligned separately, is the reference object for each row.
If you have less than one row for each line of text in your document, in which case you use a distributed alignment, the text of the current line is aligned separately, increasing the distance between the characters, thus occupying a single line of position.
Simply put, the text is less than one line, and the use of distributed alignment, then, less than one line of text on a full line of distance, the effect is the distance between characters increased.
Three, the difference between the two-aligned, dispersed alignment
To say the difference between the two, it is only said in the typesetting effect is not the same.
Because there is no difference between the two, because the layout is not the same way.
The former is to the left and right side of the vertical line as the reference object, for a multiline, to achieve the effect of multiple lines. Distributed alignment is a reference object with the current behavior, which implements the effect of a single line (and can achieve multiple rows).