Fundamentals in the Web Optimization Glossary
Welcome to our web optimization glossary, a guide designed to help you master the essential technical and strategic concepts of the digital ecosystem.
Web optimization
Web optimization is the process of improving a website’s performance, user experience and conversion through data, testing and continuous improvement. It is essential to approach this process by relying on data-driven conversion rate optimization (CRO).
Web performance
Web performance measures the speed and efficiency with which a website loads and responds to user interactions, a basic pillar of any web optimization glossary.
Loading speed
Loading speed is the time it takes for a page to display completely, and it is key for SEO, UX and conversion.
Time to First Byte (TTFB)
TTFB measures the time it takes for the server to respond to the browser’s first request.
Core Web Vitals
Core Web Vitals are Google metrics that evaluate the real user experience in terms of loading, interactivity and visual stability.
LCP (Largest Contentful Paint)
LCP measures how long it takes for the main visible element of the page to load.
FID (First Input Delay)
FID evaluates the site’s response time to the user’s first interaction.
CLS (Cumulative Layout Shift)
CLS measures visual stability and prevents elements from shifting unexpectedly during loading.
Front-end optimization
Front-end optimization focuses on improving HTML, CSS and JavaScript to reduce loading times and enhance the experience.
Back-end optimization
Back-end optimization improves servers, databases and internal logic to speed up the site’s response.
Conversion and Growth & CRO
We continue this section of the web optimization glossary by analyzing the metrics that directly impact the business.
Growth & CRO (Conversion Rate Optimization)
Growth & CRO is the discipline that seeks to increase the percentage of users who take a desired action on a website. The convergence of AI, CRO and Growth will shape the future of work in this field.
Conversion rate
The conversion rate is the percentage of users who complete a goal relative to the total number of visitors.
Call to action (CTA)
A CTA is a visual or text element designed to prompt the user to take a specific action.
Data and Measurement
Web analytics
Web analytics collects and analyzes behavioral data to optimize site performance. It is vital to combine this with the use of synthetic users in CRO to validate complex scenarios.
Technical SEO
Technical SEO
Technical SEO optimizes the site’s structure and performance to facilitate indexing. Today, it is essential to master the generative SEO (GEO) guide to stay relevant.
SEO cannibalization
SEO cannibalization occurs when several pages compete for the same keyword, a common problem that is always worth looking up in a web optimization glossary.
Testing and Experimentation
A/B test
An A/B test compares two versions of a page or element to determine which one performs better. I recommend checking out our guide on the most effective types of web A/B tests.
Multivariate test
A multivariate test evaluates multiple changes simultaneously to understand their combined impact. Learn the methodology in our multivariate testing guide.
Statistical significance
Statistical significance validates whether a test’s results are reliable or the product of chance. You can use our significance calculator for A/B tests or, if you prefer offline analysis, download our significance calculator in Excel.
Sample size
The sample size determines how many users are needed to obtain conclusive results. You can estimate this with our tool to calculate the duration of an A/B test.
Server-side testing
Server-side testing runs experiments from the server, improving performance and control.
Client-side testing
Client-side testing runs changes in the browser using JavaScript.
Advanced Growth & CRO
Behavior-based optimization
Behavior-based optimization uses real user data to prioritize improvements. It is essential to understand the types of cognitive biases that affect users, such as confirmation bias, in order to design better experiments.
Checkout optimization
Checkout optimization reduces friction in purchase processes to increase sales.
Choice architecture
Choice architecture designs environments that make it easier to make the right choices. A great example is how contextual personalization is applied to retain audiences.
Personalization
Web personalization
Web personalization adapts content and experiences based on user behavior. AI applied to web personalization is revolutionizing this field.
Web Optimization Tools
No web optimization glossary would be complete without reviewing the technical software that makes experimentation possible.
Adobe Target
Adobe Target is one of the most complete enterprise solutions for testing and personalization. You can read our analysis in the Adobe Target review or see how it performs in our comparison of Adobe Target vs Optimizely vs VWO.
AB Tasty
AB Tasty is a versatile experimentation platform. Check out our AB Tasty review to see its pros and cons.
Optimizely
Optimizely is an advanced experimentation platform for A/B tests, personalization and feature flags. Visit Optimizely
VWO (Visual Website Optimizer)
VWO allows you to run A/B and multivariate experiments and behavior analysis. Visit VWO
Bookmark this web optimization glossary to look up any technical term whenever you need it. To learn more, visit our Web Optimization category.