The UK operates a points-based immigration system underpinned by the principle of visa sponsorship. A sponsor for Tier 4 student purposes is the educational institution who supports your visa application to study a particular course in the UK.
You must apply for a Tier 4 visa prior to travelling to the UK unless you are already in the UK holding a valid visa that permits you to apply for a Tier 4 visa for study at Cambridge inside the UK.
The following pages provide detailed information on applying for a Tier 4 student visa:
The International Student Team's Visa Advice Service can provide further assistance on applying for a Tier 4 visa as well as information on related areas of immigration and post-study visa options for after you have completed your course.