Optional Practical Training (OPT)
12 Months: Granted to students on F1 (student) visa status completing undergraduate (BS/BA) or graduate (MS/MBA) degrees
24 Months Extension: Students with degrees from STEM (Science, Technology, Engineering & Mathematics) fields
Therefore, students completing a degree from the STEM field get an OPT period of total 36 months (Regular 12 months + 24 months extension), permitting them to work in the US without H1B visa.
OPT is a temporary employment authorization that is directly related to a student’s area of study. Students pursuing their education in the US on student (F1) visa are eligible to work in the US under the F1-OPT visa program, which gives them an opportunity to apply the education obtained in an academic degree to a practical work experience.