Slab serif is a type of font characterized by thick, block-like serifs at the ends of the letters. Unlike traditional serifs, which are often thin and delicate, slab serifs have a more robust and sturdy appearance. This style is commonly used in advertising and headlines due to its boldness and readability. Fonts like Rockwell and Courier are popular examples of slab serif typefaces. They are often chosen for their strong visual impact, making them suitable for both print and digital media. Slab serif fonts can convey a sense of modernity and stability, appealing to various design aesthetics.