If you want to transfer into any of the University of California schools (UCLA, Berkeley, UCI, UC Davis, UC Santa Cruz, etc.), you need to write two college application essays. One is the same prompt that all students are required to write—which basically asks for a personal statement style essay.
UPDATE Oct. 2016: The UC essay questions have changed! Please read this article for more information. How to Respond to the UC Essay Prompts Many students are quite interested in applying to one or many of the campuses within the University of California system (or. Personal Statement and Application Essay Mistakes 2013.