How has the world population changed over time?

The world population has experienced significant growth over time, particularly accelerating since the Industrial Revolution in the 18th century. From about 1 billion in 1800, the population reached 2 billion by 1927, and it surpassed 7 billion in 2011. Factors such as advancements in medicine, agriculture, and sanitation have contributed to increased life expectancy and lower mortality rates. However, growth rates are now slowing in many regions due to declining fertility rates and aging populations.