An ad partner that aggregates inventory into buying opportunities and provides static rates is known as what?

The correct answer is an ad network. An ad network plays a crucial role in digital advertising by acting as an intermediary between advertisers and publishers. It aggregates available ad inventory from multiple publishers and organizes it into purchasable ad opportunities. By doing so, it allows advertisers to access a broader range of ad placements, often at static rates that simplify the buying process.

Ad networks often focus on providing a streamlined way for advertisers to manage their campaigns effectively and ensure that they can reach their target audiences through various channels. The static rates mentioned refer to the fixed pricing model that many ad networks employ, which contrasts with dynamic pricing models that may fluctuate based on demand and competition.

The other options, while related to digital advertising, serve different functions. An ad server is primarily responsible for serving ads to websites and tracking their performance, rather than aggregating inventory. An ad manager may refer to tools or platforms used for managing ad campaigns across different channels but doesn't specifically indicate the aggregation of inventory. An aggregator, in a broader sense, could apply to various industries and does not uniquely define the role of purchasing ad inventory in the context of advertising.