Expense accounts. You’re think that the very phrase was self explanatory.
It’s an accounting of the expenses you incurred in order to perform your job.
I don’t submit my expenses to drive to work. I don’t submit my expense for my morning coffee. I’m not a great fan of the office coffee, so I get my own tea. If someone else brings in a box, I’m grateful, but I don’t get upset when I buy it myself.