Budget flighting is a bidding strategy that advertisers can use to manage their advertising budget and optimize the performance of their campaigns. In this strategy, the advertiser divides their budget into smaller chunks, or "flights," and allocates the flights to specific periods of time, such as weeks or months. The advertiser can then adjust the amount of their budget that is spent on advertising during each flight based on factors such as the expected performance of their ads and the availability of inventory. By using budget flighting, advertisers can better control their spending, avoid overspending, and maximize the impact of their advertising efforts.