Work authorization is a legal document or status that allows an individual to work in a specific country. It is often required for non-citizens or foreign nationals who wish to take up employment. This process ensures that employers hire individuals who are legally permitted to work, helping to maintain labor laws and regulations. In many countries, such as the United States, work authorization can be obtained through various means, including visas, green cards, or specific work permits. Each type of authorization has its own eligibility criteria and application process, which must be followed to ensure compliance with immigration laws.