The work permit, known as the Employment Authorization Document, is the document by which a qualifying person is granted permission to work in the United States, and to report legally to any employer. This process is of the utmost importance because it is one of the first documents that an immigrant must obtain in order to start working and achieve his economic independence.
For your renewal it is very important that you are aware of the expiration date of the work permit and that you begin the procedure in advance so that it can be sent 180 days before that date.