Conversion Rate Optimization Dictionary

To compare two versions of a webpage or element by showing each to different groups of visitors simultaneously.

A method of comparing two versions of a webpage or element to determine which performs better. Also called split testing, it involves showing version A to half your visitors and version B to the other half, then measuring which generates more conversions.

When users leave a process incomplete, especially in shopping carts or forms.

The portion of a webpage that’s visible without scrolling when a page first loads. Critical for capturing immediate visitor attention and should contain key value propositions and calls-to-action.

The practice of optimizing content and elements that appear without scrolling to maximize immediate impact and reduce bounce rates.

The state of overthinking your data to the point where you never actually implement any changes. Symptoms include having 47 different conversion theories but zero running tests.

The cognitive tendency to rely heavily on the first piece of information encountered. In CRO, used strategically by showing higher-priced options first to make other prices seem more reasonable.

The process of determining which marketing touchpoints deserve credit for a conversion. Common models include first-click, last-click, and multi-touch attribution to understand the customer journey.

The psychological tendency to follow the lead of credible, knowledgeable experts. Leveraged through expert endorsements, certifications, and professional credentials to increase trust and conversions.

An automated email system that sends pre-written messages triggered by specific actions. Essential for nurturing leads captured through conversion optimization efforts.

The average dollar amount spent each time a customer places an order. Calculated by dividing total revenue by the number of orders. Key metric for measuring conversion quality, not just quantity.

To establish baseline performance metrics for comparison with future tests.

When a visitor leaves a website after viewing only one page without taking any action.

The percentage of visitors who leave a website after viewing only one page without taking any action. A high bounce rate often indicates poor user experience or mismatched visitor expectations.

The obsessive belief that changing button colors will magically solve all conversion problems. Often accompanied by endless debates about whether orange or green converts better (spoiler: it depends).

A button, link, or element that prompts visitors to take a specific action, such as “Buy Now,” “Sign Up,” or “Download Free Guide.” Effective CTAs are clear, compelling, and strategically placed.

To advocate for or promote a winning test variation or optimization strategy.

The irrational attachment to a winning test variation, leading to the delusion that it will work everywhere forever. Often results in trying to apply the same “winning” element to every page on the site.

The jealous feeling when a competitor’s landing page gets more clicks than yours. Usually leads to shameless copying of their design “for inspiration purposes only.”

The percentage of people who click on a specific link out of the total who view it. Calculated as: (Clicks ÷ Impressions) × 100. Important for measuring ad and email performance.

The amount of mental effort required to process information or complete a task. High cognitive load reduces conversions; effective CRO minimizes mental effort required from users.

A statistical measure (typically 95% or 99%) that indicates how certain you can be that test results are not due to random chance. Essential for determining when A/B test results are statistically significant.

A distributed network of servers that delivers web content from locations closest to users, improving page load speeds and conversion rates.

The path visitors take from initial awareness to final conversion, typically narrowing at each stage. Understanding funnel drop-off points helps identify optimization opportunities.

The phenomenon where marketers become so focused on optimization that they lose sight of basic user experience. Results in websites that convert well but feel like navigating a used car lot.

The percentage of visitors who complete a desired action (conversion) out of total visitors. Calculated as: (Conversions ÷ Total Visitors) × 100.

To successfully persuade a visitor to complete a desired action, such as making a purchase or signing up.

The total cost of acquiring a new customer, including marketing spend, sales costs, and overhead. Essential for determining profitability and ROI of conversion optimization efforts.

The predicted total revenue a customer will generate during their relationship with your business. Used to justify acquisition costs and prioritize retention strategies.

The state of being so intoxicated by metrics and analytics that you forget real humans use your website. Warning signs include referring to visitors as “traffic” in casual conversation.