Foreign students who complete a course of studies (usually a bachelor's or master's degree) will often have one year of work authorization called "optional practical training" (OPT).  These students can work for any employer in their field for the one year period and the employer does not have to file any papers with U.S. Citizenship & Immigration Services (USCIS) or get any advance permission to hire the student.  The company does not have to provide "training," as such; mere employment in the field is acceptable.  Currently a plastic laminated "employment authorization document" (EAD) evidences USCIS’ approval of practical training of this type.  Additionally, "curricular practical training" may entitle the employee to work under conditions which will be noted on the foreign student form (the "I-20" form) as to duration and number of hours.  The school official approves this type of employment authorization.