What is UX and why does it matter?

UX, or user experience, refers to the overall quality of the interaction between a user and a product, service or digital interface. It encompasses usability, accessibility, perceived performance, satisfaction and the entire user journey. In a digital context where users have immediate alternatives, the quality of UX is a decisive factor in retention, conversion and loyalty.

This guide presents the components, principles and design process of UX for marketing professionals, decision-makers and webmasters.

The key components of UX

User experience rests on four fundamental components. Each contributes to the overall quality of the interaction and must be considered throughout the design process.

1. Usability

Usability measures the ease with which a user completes a given task on an interface. It is evaluated against three main criteria: effectiveness (does the user achieve their goal?), efficiency (in how many steps and how much time?) and satisfaction (is the experience perceived as pleasant?). For example, an e-commerce checkout process that requires more than 4 steps presents a high risk of cart abandonment.

2. Accessibility

Accessibility ensures that the product is usable by everyone, including people with disabilities (visual, motor, cognitive or auditory). The WCAG (Web Content Accessibility Guidelines) standards define the criteria to follow: sufficient color contrast, keyboard navigation, compatibility with screen readers (software that reads the screen content aloud), and alternative text for images. Accessibility is not an optional add-on but a baseline quality criterion.

3. Desirability

Desirability is the interface's ability to generate a positive perception in the user through its aesthetic quality: typographic choices, color harmony, visual quality, micro-interactions (subtle animations that accompany user actions, such as a button changing state on hover). Desirability strengthens engagement and the perceived quality of the product.

4. Value

UX value evaluates how well the product meets users' actual needs. A product can be usable, accessible and visually polished, yet lack value if its content or features do not match the expectations of the target audience. User research helps verify this alignment between offering and needs.

The user's perception

Users remember the quality of their experience more than the list of features available. A slow, confusing or hard-to-read interface produces a negative perception that transfers to the product or service, regardless of its intrinsic quality. Conversely, a smooth and consistent experience builds trust and encourages return visits.

The fundamental principles of good UX design

UX design rests on proven principles that combine insights from cognitive psychology with a user-centered approach.

  1. Understand users: identify their goals, behaviors and points of friction through user research (interviews, observation, data analysis).

Example: users of a travel booking site expect a powerful search engine with relevant filters and quickly loaded results.

  1. Design clear and consistent journeys: every interaction must have an identifiable purpose. Calls to action (CTAs) should use explicit labels ("Add to cart", "Create an account") and follow established interface conventions for placement.
  2. Apply principles of cognitive psychology: the Hick-Hyman law states that decision time increases proportionally with the number of options. Limiting simultaneous choices and guiding users step by step reduces drop-off and improves journey completion rates.

The UX design process

UX design follows an iterative process structured in four phases.

Step 1: Research

Collect data on your users through quantitative methods (analytics, behavioral metrics) and qualitative ones (interviews, usability tests, surveys). Example: analyzing cart abandonment data to identify at which step of the conversion funnel users drop off.

Step 2: Design

Based on the data collected, create wireframes (low-fidelity structural diagrams) to define the information architecture and user journeys, then interactive prototypes to simulate real interactions.

Step 3: User testing

Before going to production, test the prototypes with a representative panel of real users. Usability tests identify friction points, misunderstandings and drop-offs along the journey. Each issue identified is documented and prioritized for correction.

Step 4: Iterations

UX is a continuous process. Data collected after deployment (analytics, user feedback, A/B tests) feeds new design and improvement phases. Each iteration measures the impact of changes against the defined KPIs.

Audit the existing site

Analyze the live site or application. Identify pages with high bounce rates, abandoned journeys and friction points reported by users or detected via heatmaps (visualizations of click and scroll zones).

Collect user data

Combine quantitative data (Google Analytics, conversion metrics) with qualitative data (user interviews, session recordings via Hotjar) to gain a complete view of behaviors and expectations.

Identify and prioritize issues

Synthesize the collected data into a list of UX issues prioritized by their impact on business goals (conversion, retention) and their frequency.

Design solutions

Create wireframes and prototypes for each proposed solution. Validate every proposal through user testing before handing the specifications to the development teams.

Measure results

After implementation, measure the impact of the changes on the defined KPIs (conversion rate, drop-off rate, user satisfaction score) and start a new iteration cycle if necessary.

UX across platforms: web, mobile and beyond

On the web

A high-performing website in UX terms meets the standards of speed (Core Web Vitals), responsiveness and accessibility. Optimizing load times — image compression, caching, lazy loading of non-critical resources — has a direct impact on visitor retention.

On mobile

Mobile design comes with specific constraints: limited screen space, touch interaction, varied usage contexts. Touch targets should respect a minimum size of 44x44 pixels (Apple Human Interface Guidelines recommendation), forms should be simplified, and navigation should favor native gestures (swipe, vertical scroll).

Beyond digital

UX principles also apply to physical interfaces: interactive kiosks, connected objects (IoT), embedded interfaces. In each case, the goal remains the same: minimize the cognitive and motor effort required to complete a task.

How to measure UX success?

Key performance indicators (KPIs)

  1. Conversion rate: percentage of visitors who complete the target action (purchase, sign-up, contact request).
  2. Drop-off rate: percentage of users who leave a conversion funnel before completing it. A cart abandonment rate above 70% signals a UX problem in the checkout process.
  3. Satisfaction score (CSAT, NPS): CSAT (Customer Satisfaction Score) measures one-off satisfaction; NPS (Net Promoter Score) gauges willingness to recommend the product. These metrics quantify the qualitative perception of the experience.

Tools and resources for UX design

Recommended tools by process phase:

  • Wireframing and prototyping: Figma, Adobe XD, Sketch — to design and test user journeys before development.
  • Behavioral analytics: Google Analytics, Hotjar (heatmaps and session recordings) — to measure real user behavior.
  • Usability testing: UsabilityHub, Maze — to gather structured feedback on prototypes from user panels.

Examples: successful UX and UX to avoid

A good example: Airbnb

Airbnb's interface structures the search journey with a central search engine, progressive filters and a visual presentation of results that reduces decision-making effort. The booking journey is linear and each step clearly displays the information needed to make a decision.

A bad example: excessive forms

A sign-up form that asks for more than 5 non-essential fields significantly increases the abandonment rate. The design principle recommends collecting only the information strictly necessary at the current step, and deferring additional requests to a later moment in the journey (the progressive disclosure technique).

UX evolves alongside technology: AI-powered personalization (contextual recommendations, adaptive interfaces), conversational interfaces (chatbots, voice assistants) and increasingly sophisticated micro-interactions will redefine user experience standards in the years to come.

UX: a structuring factor of performance

Investment in UX produces measurable results: improved conversion rates, reduced drop-off, increased loyalty and stronger brand perception. The UX design process — research, design, testing, iteration — provides a methodological framework for continuously improving the quality of the experience offered to users.

Today's tools and methodologies make this approach accessible to any organization, regardless of size. The key is to integrate the user perspective into every design decision and to validate every hypothesis with data.