Block Format on Business Letter (in English)

The format (layout) is the visual organisation of a business letter. The main business letter formats are:

~ Full-Block Style - All the elements are aligned to the left margin and there are no indented lines. This is a standard block-style format that is accepted by most businesses. 

~ Modified Block Style - The return address, date, closing and signature start just to the right of  the center of the page or may be flush with the right margin. All body paragraphs begin at the left margin.
  
~ Indented or Semi-Block Style - Similar to the modified block business letter style except that the first line of each paragraph is indented.