Vitality
In short
Vitality is the capacity for living things to grow, develop, and maintain life. It is the fundamental quality that separates biological organisms from non-living matter.
In plain words
It is the energy and strength that allows something to stay alive and active. In humans, it refers to feeling energetic and mentally alert.
A simple example
A healthy plant with bright green leaves and fast growth shows high vitality. A wilting plant with no movement shows low vitality.
Why it matters
Understanding vitality helps scientists study how life functions and how organisms survive. For people, maintaining vitality is essential for physical health and mental well-being.
Easy to mix up
Do not confuse vitality with mere activity; a machine can move without being alive.