What does an assembler do?

I don't know if you mean that you have done assembly work before, or that the job you interviewed is an assembler. If you mean that the job you are applying for now is an assembler and you don't know what this job is, you can explain it like this: an assembler refers to assembling a scattered object into a semi-finished product or a finished product, and another explanation is related to loading. Simply put, it depends on what your company does.