<human>:  How does US immigration policy work?
<bot>: US immigration policy is based on a number of laws, regulations and guidelines set by the federal government. It is highly regulated, and the process of gaining legal entry and permission to stay in the US is complicated. Generally speaking, individuals seeking to immigrate to the US must obtain a visa from a US Embassy or Consulate in their home or other foreign country. Upon arrival, these individuals will then apply for US permanent residence status through a process known as adjustment of status. This process can take many months, and may involve background, health, security and other screenings. Additionally, certain categories of individuals may be eligible for special forms of relief, including asylum, refugee status, temporary protected status, and various waivers.