Which letter format uses indented paragraphs?

In letter formatting, the semi-block letter style is characterized by the use of indented paragraphs. Each paragraph in a semi-block letter begins with a tabbed indentation, which sets it apart visually from block and full block styles where the paragraphs start at the left margin without any indentation.

The semi-block format typically combines the features of block formatting with traditional letter writing, allowing for indented paragraphs while maintaining a somewhat structured appearance. This style is often preferred for its formal yet personal touch, reflecting a blend of both modern and classical letter presentation.

In contrast, the block letter format features all lines aligned to the left, without any indentations. Full block letters follow the same principle as block letters, where every element, including the date, closing, and signature, aligns to the left margin. Modified block letter formats have specific sections, like the date and closing, centered, and still provide no indentations for the paragraphs.

Thus, the use of indented paragraphs uniquely identifies the semi-block letter formatting style.