Soft power is relative to hard power. Soft and hard have a metaphorical meaning and are a metaphorical description of strength.

Hard power refers to the objective power that can have influence

A simple analogy is that soft power can be thought of as our country’s high economy, strong scientific and technological strength, many scientific research achievements, etc. , hard power means that I have guns, cannons, missiles and nuclear bombs, and I will kill you if you dare to come