Do you have a Masters degree in a specialized field and a United States based company who is willing to sponsor you? You may qualify for an EB-3 I-140 petition. First, you will need to go through the PERM system to obtain a Labor Certification.
Then you need to have an employer who is willing to sponsor you through the I-140 as the second step toward receiving a green card. Once the I-140 is approved, you can either adjust status or consulate process to actually get the Green Card. The EB-3 is a way for highly educated individuals to ultimately obtain their Green Card through employment based petitions.