What is the UCLA student services fee?

Could you please clarify for me what exactly the UCLA student services fee entails? Is it a mandatory fee that all students have to pay, or is it optional? What specific services does this fee cover? Is there any transparency in how the funds are allocated and utilized? Furthermore, are there any exemptions or waivers available for students who may be facing financial difficulties? I'm keen to understand the rationale behind this fee and how it contributes to the overall student experience at UCLA.