What does it mean when someone is observation?

An observation is something that you have learned by seeing or watching something and thinking about it. ... If a person makes an observation, they make a comment about something or someone, usually as a result of watching how they behave.

What is observation example?

A doctor watching a patient after administering an injection. An astronomer looking at the night sky and recording data regarding the movement and brightness of the objects he sees. A zoologist watching lions in a den after prey is introduced to determine the swiftness of the animals' response.