Slab serif fonts, also known as Egyptian or square serif fonts, are characterized by their thick, block-like serifs. These serifs give the typeface a bold and modern look, making them ideal for headlines and emphasis. Some popular slab serif fonts include:

1. **Rockwell**: A classic slab serif font known for its bold and geometric design, Rockwell is often used for its strong visual impact.
2. **Roboto Slab**: A slab serif variant of the popular Slab Serif Fonts Roboto font, Roboto Slab offers a modern and versatile option for both print and digital design.
3. **Courier**: Originally designed for use in typewriters, Courier is a monospaced slab serif font known for its distinctive appearance and readability.
4. **Clarendon**: A traditional slab serif font with roots in the 19th century, Clarendon is known for its robust and authoritative look.
5. **Museo Slab**: A slab serif companion to the Museo font family, Museo Slab offers a contemporary and stylish option for various design projects.
6. **Roboto Mono**: Another slab serif variant of the Roboto font, Roboto Mono is a monospaced typeface suitable for coding and technical applications.
7. **Slabo**: A serif font specifically designed for use in web content, Slabo offers a readable and modern option for online typography.

These slab serif fonts are often used in advertising, branding, and editorial design for their bold and impactful appearance. They can also add a touch of modernity to traditional design projects.