All applications for undergraduate degrees are made through the Universities and Colleges Admissions Service (UCAS) Apply system.
Ask your teacher or adviser from your school or college for the UCAS buzzword. You need the buzzword when you register on the Apply system. This makes it clear which school or college you are applying from.
All UK schools and colleges and a small number of EU and international establishments are registered with UCAS.
If you are applying independently, or are applying from a school or college which is not registered to manage applications, you will still use the Apply system but you do not need a buzzword.
On the UCAS website you can also find out more about: