Lifetime budget means setting one total amount for your entire campaign instead of a daily limit. Instead of saying "spend $10 per day," you say "spend $70 total over 7 days." The platform then intelligently distributes that budget, spending more on high-performing days and less on slow ones.
For example, if you're running an Eid campaign for 7 days with a 7,000 taka lifetime budget, Facebook will automatically spend more on days when engagement is highest. This is smarter than daily budgets because the algorithm optimizes for results. Use lifetime budgets when you have a fixed campaign duration and total spend in mind.