下面 (xià miàn) means 'below/under' for physical position (e.g., under a table) and 'next/the following' for order in text or speech. It is more specific than 下 (xià), which is a general 'under' often used in fixed words; 以下 (yǐ xià) is more formal and refers to a level or limit. 下面 is the everyday word for both space and sequence.