Shows how much damage a creature can take before it either dies or is so badly hurt it can't fight any more. Most humans/human-sized creatures have a Wounds value of only 1. Large monsters are often able to withstand several wounds that would slay a smaller creature and so have a Wounds value of 2, 3, 4 or more.
Wounds
Source: Core Rulebook 3E, p. 38
How much damage a creature can take before it dies or is too badly hurt to fight on.