only that, because you will be able to choose the font style, bold, cursive, color, size,... With it you will be able to correctly choose the font you need for a certain task.
And if you don’t know how it will look like when printed, print it, and it will print a paper with the text you want in different fonts.
Don’t worry if what you want is to know which font you are going to install, because Advanced Font Viewer also reads non-installed fonts.