A group of individuals or organisms of any species living in a well–defined geographical area, at a specific time with the capability of interbreeding is known as a population.
A standardized data on all the individuals in a population that are native or present at the time of counting is known as a population census.
The process of gathering, compiling, examining, or distributing demographic, social, and economic information related to a particular time of all the individuals in a place or a well-defined region is a population census.