For example, at the account level I might use this feature to mark certain accounts as "Lead Gen" or "eComm", or I could give a label to the accounts that have budgets that change on a monthly basis. Then, on the first of each month, I'd come into AdEvolver, filter by that label and update the budgets for the month.
In campaigns, labels could be used for branded/unbranded, ecomm/lead gen, tofu/mofu/bofu, etc. There are tons of use cases why this could be beneficial.