Why a country population is the number of people who live there?

A country's population is defined as the total number of individuals residing within its borders at a given time. This figure includes citizens, residents, and sometimes temporary visitors, reflecting the demographic and social dynamics of the nation. Population size is crucial for understanding economic, political, and social issues, as it influences resource allocation, infrastructure development, and public policy. It also plays a significant role in shaping a country's cultural identity and growth potential.