借助转化追踪，可以实现哪些类型的转化？

Conversion tracking allows you to measure a wide range of valuable actions users take after interacting with your ads. This includes online purchases, which directly impact revenue; downloads of content like e-books or apps, indicating engagement; and website visits, which can be a first step in a longer conversion funnel. The other options are partially correct but less comprehensive. While "sales leads" is a type of conversion, it's not as broad as the correct answer. Similarly, "retail purchases," "phone calls," and "event attendees" are specific conversion types, but the correct answer encompasses a broader and more common set of digital conversions tracked through online platforms.