Design Topics:

Serif

•  Serif fonts have little decorative strokes that extend from the tips of letters. It improves the readability.  
•  Serif fonts are originally used in newspaper and book publishing.
•  Print design and headlines on the web, easily recognize our brains.
•  Examples: Times (New) Roman, Rockwell, Georgia, Baskerville.

                     

Sans -Serif

• Sans serif font does not include any extra strokes at the ends of the letter.
• Sans Serif used in web design and small blocks of text. 
• The simplicity of sans serif fonts legible and easier to read.
• Examples: Helvetica, Arial, Verdana and Tahoma.