[null,null,["最后更新时间 (UTC)：2025-08-27。"],[[["\u003cp\u003eThe \u003ccode\u003eReachPlanService\u003c/code\u003e forecasts the cost and reach of your media plan based on demographics, duration, devices, and budgets.\u003c/p\u003e\n"],["\u003cp\u003eThis feature is currently available to allowlisted accounts only; contact your Google representative for access.\u003c/p\u003e\n"],["\u003cp\u003eYou can define your media plan, authenticate with the service, and generate reach curves using the provided resources and guides.\u003c/p\u003e\n"],["\u003cp\u003eThe glossary clarifies terms like 'Census Audience Size', 'Effective Frequency', and 'On Target Impressions' for better understanding.\u003c/p\u003e\n"]]],[],null,["# Concepts\n\n| **Important:** This feature is available to allowlisted accounts only. Contact your Google representative if you need access to the feature.\n\n\u003cbr /\u003e\n\nFor a given media plan, [`ReachPlanService`](/google-ads/api/reference/rpc/v21/ReachPlanService)\ngenerates forecasts of how much it would cost to reach your audience. Media\nplans are composed of demographic targeting, campaign duration, device types,\nand a set of budgets allocated to various ad formats. The forecast is a curve of\nreach and impression levels at increasing budgets. Subsequent pages in this\nguide describe how to:\n\n- [Authenticate to the service](/google-ads/api/docs/reach-forecasting/authentication)\n- [Specify a media plan](/google-ads/api/docs/reach-forecasting/media-plan)\n- [Generate a curve](/google-ads/api/docs/reach-forecasting/generate-curve)\n\nGlossary of terms\n-----------------\n\nThis guide assumes familiarity with [Google Ads](https://ads.google.com), media\nplanning and reach curves. The below list explains certain terms in more detail.\n\n| Term | Definition |\n|-----------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| Census Audience Size | The census size of an audience for your plan's given country, age range, and gender. |\n| Effective Frequency | The minimum number of times that a user is exposed to a YouTube ad. |\n| Effective CPM | The CPM for on-target impressions. |\n| Frequency Cap Setting | Limits the number of times that the YouTube ad is served to the same cookie-identified user during a specified time interval. The frequency output can sometimes be higher than the frequency cap due to cross-device and cookie latency. |\n| On Target Impressions | Number of ad impressions. This only includes impressions that exactly match the targeting. |\n| On Target Reach | Number of unique people who may be reached at least the Effective Frequency number of times. This only includes people who exactly match the targeting. |\n| Total Impressions | Number of ad impressions. This includes impressions that may fall outside the specified Targeting, due to insufficient information on signed-in users. |\n| Total Reach | Number of unique people who may be reached at least the Effective Frequency number of times. This includes people who may fall outside the targeting. |\n| YouTube Audience Size | The total commercially-reachable size of an audience on YouTube for your plan's given country, age range, and gender. |"]]
