Border security refers to the measures and policies implemented by a country to protect its borders from illegal activities, such as smuggling and unauthorized immigration. This involves the use of personnel, technology, and infrastructure to monitor and control the movement of people and goods across borders. Countries often employ agencies like the Customs and Border Protection (CBP) in the United States to enforce laws and regulations. Effective border security aims to ensure national safety while facilitating legitimate trade and travel, balancing security needs with economic interests.