任何 (rèn hé) is a pronoun meaning 'any' — it emphasizes 'any one, no matter which,' often with 都 or 也 in general statements and negatives. Unlike 什么 (shén me), which can mean 'something; anything' but focuses on 'what,' 任何 stresses 'every possible' and is more emphatic. It contrasts with 一切 (yī qiè 'everything; all'), which refers to the entire set rather than any individual.