To transfer an H1B Visa to a new employer.

H1B- the US work visa- is an extendible visa allowing you to work with new US employers without any time restrictions. It implies one can apply for H1B transfer as many times as needed. H1B visa transfer is the legal procedure to change employment from existing employer to a new employer, provided that the new employer applies for a whole new H1B visa petition with USCIS on behalf of you.