there are six metrics earlier check the updated and explain what each metrics in impression share mean how can we judge and analyze it and use it

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Accepted Answer

Impression share metrics measure the percentage of times your ads were shown out of the total number of times they could have been shown.

Impression share (IS) - the percentage of impressions you received divided by the estimated number of impressions you were eligible to receive
Search impression share (SIS) - the percentage of impressions you received in the search network divided by the estimated number of impressions you were eligible to receive
Display impression share (DIS) - the percentage of impressions you received in the display network divided by the estimated number of impressions you were eligible to receive
Lost impression share (LIS) - the percentage of impressions you lost due to rank or budget constraints
Absolute top impression share (ATIS) - the percentage of impressions you received in the top position above organic search results
Top impression share (TIS) - the percentage of impressions you received in the top positions above organic search results
Analyzing impression share metrics can help identify areas for improvement in ad rank, budget, and targeting
For example, a low SIS may indicate a need to improve ad relevance or increase bids
A high LIS may suggest a need to increase budget or improve ad quality to increase ad rank
Using impression share metrics can help optimize campaigns for maximum visibility and performance

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