In a Reach and Frequency report, “Frequency” is defined as the:

In a Reach and Frequency report, “Frequency” is defined as the:

  • Average number of times a video ad is played by a user.
  • Average number of times a user is exposed to an ad.
  • Total number of ad impressions.
  • Average number of times an ad appears on a single webpage.

The Correct Answer is:

  • Average number of times a user is exposed to an ad.

Explanation: Reach is the number of visitors exposed to an ad. Increased reach means that an ad is exposed to more potential customers, which may lead to increased awareness. Frequency is the average number of times a visitor was exposed to an ad over a period of time.

You can read more here: https://support.google.com/partners/answer/1722064?hl=en