CSS font-family (font family) has a number of values, such as Arial,georgia, Arial, Young Circle and so on.
Can be divided into two types, serif font (serif) and sans serif font (sans-serif).
If the font's stroke has an end enhancement, it is the serif font (serif), which is also understood: the serif font has an extra decoration at the beginning and end of the stroke, and the thickness of the stroke varies depending on the vertical horizontal line.
If the stroke end of the font is not strengthened, then there is no liner font (SANS-SERIF), where the stroke starts and ends without additional decorations, roughly the same as the stroke thickness.
Serif fonts are: Serif,georgia,garamond, Times New Roman, song body, etc.
Sans serif fonts: Sans-serif,tahoma,verdana, Arial, Helvetica, young circles, script, etc.
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