“靠 (kào)” vs. “依靠 (yīkào)”: These are similar, but
依靠 (yīkào) is more formal and often implies a deeper, more profound, or even existential dependence.
靠 is the workhorse word used in everyday speech for all forms of leaning and relying. You
靠 a wall, but a child might
依靠 their mother.