Serif and sans-serif are the parent fonts to all the available fonts. Serif fonts usually have a hook (commonly known as feet) for all the letters, whereas in sans-serif (sans means without in French), we will not have those hooks. From the above image, we could clearly see that for the first ‘F’ I have hooks which are highlighted by circles and these are also called as feet. Whereas, we don’t have the feet in the second ‘F’. It’s important to always know which font-family that font which you are using belongs to. Some of the examples of popular serif fonts are Times New Roman, Bookman, Baskerville, Cambria, Courier, Century, Copper Black, Minion, and New York. Some of the examples of popular sans-serif fonts are Arial, Calibri, and Comic Sans, Helvetica, Geneva, San Francisco, and Ubuntu.