Explain daily budget vs. total budget

Daily Budget

This is the maximum daily spend for the campaign. A campaign will never spend more than this amount per day. A campaign may spend less than this amount.

Total Budget

This is the maximum total spend for the campaign. Once campaign budget is reached the campaign will automatically pause (even if the daily budget has not yet been exhausted for that day).

Both Daily Budget & Total Budget can be found within the Budget tab of Campaign Settings