A text block refers to a cluster of text elements, like paragraphs or blockquotes, arranged together to form a visually coherent unit. This grouping typically assumes a rectangular shape, hence the term "block." In the context of low-fidelity wireframing, text blocks serve as placeholders, often filled with dummy text.

These placeholders help designers visualize the spatial relationships between text elements, facilitating decisions on layout and content organization. By using text blocks effectively, designers can create more readable and engaging experiences for users.