The terms "Serif" and "Sans Serif" refer to two basic types of fonts used in graphic and web design.

"Serif" refers to fonts that have small lines or embellishments at the ends of the letters. These small lines are called "serifs". Serif fonts are often perceived as more traditional and formal. A well-known example of a serif font is Times New Roman.

"Sans Serif", on the other hand, refers to fonts that do not have serifs. "Sans" comes from the French and means "without". Sans serif fonts have a smooth and clean appearance and are often considered more modern and clearer. A well-known example of a sans-serif font is Arial.

The choice between serif and sans serif has an impact on the design and visual character of a website or design. Serif fonts are often used for printed texts, such as books or newspapers, as the serifs support the eye in long sections of text and can make the text easier to read.

Sans-serif fonts are often used in digital media and web design as they are easy to read on screens and different screen sizes. They are often found on websites, apps and presentations.

The choice between serif and sans serif depends on various factors, such as the desired style, legibility, the purpose of the design and the target group. Both fonts have their own characteristics and can be used depending on the design project and personal taste.