the action or process of observing something or someone carefully or in order to gain information
Observation is the active acquisition of information from a primary source. In living beings, observation employs the senses. In science, observation can also involve the recording of data via the use of instruments. The term may also refer to any data collected during the scientific activity. Observations can be qualitative, that is, only the absence or presence of a property is noted, or quantitative if a numerical value is attached to the observed phenomenon by counting or measuring.
Observation is the process of watching someone or something. Often, observation is an informal action, but it can also be formal and involve data collection.