The default font has the name Computer Modern and is of very good quality. It is actually a whole font family that contains bold, italic, sans-serif, typewriter, and more font versions. All the fonts are well composed to fit together.
If you would like to change the font, use a complete bundle or carefully select font families based on shape and size. That's because, besides giving a good appearance to the document overall, it is important that all font families are compliant to each other when they are used together.
In this recipe, we will take a look at some font sets and recommended combinations.
For the fonts you would like to use, their files should already be installed on your TeX system. If not ...