{"id":20606,"date":"2020-01-30T13:21:40","date_gmt":"2020-01-30T13:21:40","guid":{"rendered":"https:\/\/www.arimetrics.com\/glosario-digital\/impression"},"modified":"2026-09-27T09:30:54","modified_gmt":"2026-09-27T09:30:54","slug":"impression","status":"publish","type":"encyclopedia","link":"https:\/\/www.arimetrics.com\/en\/digital-glossary\/impression","title":{"rendered":"Impression"},"content":{"rendered":"<p><img decoding=\"async\" class=\"boxpad alignright wp-image-80739 size-full\" src=\"https:\/\/www.arimetrics.com\/wp-content\/uploads\/2026\/09\/impression-glosario-600.jpg\" alt=\"Impression\" width=\"300\" height=\"300\" srcset=\"https:\/\/www.arimetrics.com\/wp-content\/uploads\/2026\/09\/impression-glosario-600.jpg 600w, https:\/\/www.arimetrics.com\/wp-content\/uploads\/2026\/09\/impression-glosario-600-300x300.jpg 300w, https:\/\/www.arimetrics.com\/wp-content\/uploads\/2026\/09\/impression-glosario-600-150x150.jpg 150w, https:\/\/www.arimetrics.com\/wp-content\/uploads\/2026\/09\/impression-glosario-600-360x360.jpg 360w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><strong>Definition:<\/strong><\/p>\n<p>An <strong>impression<\/strong> is the record of an advertisement, post, result, or other digital content appearing according to a platform&#8217;s measurement rules. Each new appearance that qualifies may generate another impression, even when it relates to the same person.<\/p>\n<p>The metric indicates opportunities for exposure, not confirmed attention. <strong>An impression alone does not prove that the content was seen, read, or remembered<\/strong>. Interpreting the figure requires knowing which event the platform uses to count it.<\/p>\n\n<h2>How an impression is counted<\/h2>\n<p>The advertising, analytics, or publishing system records an event when the content meets its defined technical criterion. Some platforms count delivery or appearance, while others require the resource to load or enter a particular area of the screen.<\/p>\n<p>The main counting approaches are:<\/p>\n<ul>\n<li><strong>Served:<\/strong> the server delivers the advertisement or content to the requested placement.<\/li>\n<li><strong>Rendered:<\/strong> the resource loads and is represented on the page, application, or interface.<\/li>\n<li><strong>Displayed:<\/strong> the platform records that the content appeared in a placement or on a screen.<\/li>\n<li><strong>Viewable:<\/strong> an additional viewability criterion is applied to the percentage and amount of time that the content remains on screen.<\/li>\n<\/ul>\n<p>These categories are not interchangeable and are not applied in the same way by every system. Therefore, <strong>two platforms may report different figures for the same campaign or post<\/strong> even though both use the word impression.<\/p>\n<h2>Difference between impressions and reach<\/h2>\n<p>Reach estimates or counts unique people, accounts, or devices exposed to content during a period. Impressions count total appearances, so the same person may generate several of them.<\/p>\n<p>If a post records 1,000 impressions and reaches 600 accounts, part of the audience received it more than once. The relationship between the two measures helps calculate average frequency, although the result depends on the platform&#8217;s ability to recognize users or devices.<\/p>\n<p>An impression is not equivalent to a play, interaction, or click. <strong>Each metric describes a different event<\/strong>: appearing, being played, receiving an action, or taking a user to another destination.<\/p>\n<h2>Metrics related to impressions<\/h2>\n<p>Impressions provide the basis for several advertising and distribution indicators. Their meaning depends on the numerator, time period, and measurement criterion used to construct each metric.<\/p>\n<p>Common indicators include:<\/p>\n<ul>\n<li><strong><a href=\"https:\/\/www.arimetrics.com\/en\/digital-glossary\/ctr\">CTR<\/a>:<\/strong> divides clicks by impressions and expresses the proportion of appearances that generated a click.<\/li>\n<li><strong><a href=\"https:\/\/www.arimetrics.com\/en\/digital-glossary\/cpm\">CPM<\/a>:<\/strong> represents the cost per thousand recorded impressions.<\/li>\n<li><strong>Frequency:<\/strong> relates impressions to reach to estimate how many times the content was shown to each reached person or account.<\/li>\n<li><strong>Viewability:<\/strong> indicates the proportion of measurable impressions that met the established visibility criterion.<\/li>\n<li><strong>Impression share:<\/strong> compares the impressions obtained with those that the system estimates could have been achieved in a particular context.<\/li>\n<\/ul>\n<p>A high volume may be useful in awareness or distribution campaigns, but it does not determine the outcome by itself. <strong>Evaluation should relate impressions to the objective<\/strong>, audience, cost, and subsequent actions.<\/p>\n<h2>Limitations of impressions<\/h2>\n<p>The figure may be affected by technical differences, automated traffic, refreshes, blocked content, or difficulties recognizing the same person across devices. These limitations do not invalidate the metric, but they affect comparisons.<\/p>\n<p>Analysis should distinguish the following situations:<\/p>\n<ul>\n<li><strong>Visibility:<\/strong> recorded content may be outside the visible area or remain on screen for a very short time.<\/li>\n<li><strong>Invalid traffic:<\/strong> bots, automatic refreshes, or fraudulent activity may generate events that are later filtered or adjusted.<\/li>\n<li><strong>Duplication:<\/strong> the same person may produce many impressions within the analyzed period.<\/li>\n<li><strong>Fragmented measurement:<\/strong> browsers, applications, and devices may record or attribute appearances differently.<\/li>\n<li><strong>Comparability:<\/strong> methodology changes or different definitions prevent reliable comparison without first reviewing their scope.<\/li>\n<\/ul>\n<p>An impression is therefore a unit of distribution rather than complete proof of impact. <strong>Its analytical value emerges when combined with reach, frequency, viewability, clicks, conversions, and cost<\/strong> according to the objective being measured.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>An impression records the appearance of an advertisement or digital content. Learn how it is counted, how it differs from reach, and its limitations.<\/p>\n","protected":false},"author":6,"featured_media":80741,"template":"","encyclopedia-tag":[1231],"class_list":["post-20606","encyclopedia","type-encyclopedia","status-publish","has-post-thumbnail","hentry","encyclopedia-tag-advertising-measurement"],"_links":{"self":[{"href":"https:\/\/www.arimetrics.com\/en\/wp-json\/wp\/v2\/encyclopedia\/20606","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.arimetrics.com\/en\/wp-json\/wp\/v2\/encyclopedia"}],"about":[{"href":"https:\/\/www.arimetrics.com\/en\/wp-json\/wp\/v2\/types\/encyclopedia"}],"author":[{"embeddable":true,"href":"https:\/\/www.arimetrics.com\/en\/wp-json\/wp\/v2\/users\/6"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.arimetrics.com\/en\/wp-json\/wp\/v2\/media\/80741"}],"wp:attachment":[{"href":"https:\/\/www.arimetrics.com\/en\/wp-json\/wp\/v2\/media?parent=20606"}],"wp:term":[{"taxonomy":"encyclopedia-tag","embeddable":true,"href":"https:\/\/www.arimetrics.com\/en\/wp-json\/wp\/v2\/encyclopedia-tag?post=20606"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}