Click-Through Rate (CTR)
Click-through rate is the percentage of people who click on a link compared to the total number who see it. In email marketing, CTR measures clicks on links within an email relative to delivered emails. In SEO, it measures clicks on a search result relative to impressions. CTR is a key indicator of content relevance and call-to-action effectiveness.
Related Terms
Conversion Rate
Conversion rate is the percentage of visitors or leads who complete a desired action, such as making a purchase, filling out a form, or subscribing to a newsletter. It is calculated by dividing the number of conversions by the total number of visitors and multiplying by 100. Improving conversion rate (CRO) is often more cost-effective than increasing traffic.
Email Open Rate
Email open rate is the percentage of recipients who open an email campaign. It is calculated by dividing unique opens by the number of delivered emails. While open rate tracking has become less accurate due to privacy changes (like Apple Mail Privacy Protection), it remains a useful directional metric for subject line effectiveness and sender reputation.
SERP (Search Engine Results Page)
A SERP is the page displayed by a search engine in response to a user query. Modern SERPs include organic results, paid ads, featured snippets, knowledge panels, local packs, image carousels, and more. Understanding SERP features helps SEO practitioners optimize content for the specific result types that appear for their target keywords.