What is user interface (UI): meaning, principles, and examples

A user interface (UI) is the point of human-computer interaction—everything an end user sees, touches, or clicks to interact with a device’s hardware or software. Display screens, mice, keyboards, buttons, app icons, and text fields are all parts of a user interface.

A good UI lets the user achieve maximum outcomes with minimum effort. It should be intuitive, appealing to the senses, and work effectively—which is the job of user interface and user experience design.

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What is user interface design?

User interface design creates the visual elements and interactive properties that enable users to access, understand, and use an interface to perform desired actions. The field deals with making sure the interface looks and feels good.

Principles of quality

A user-friendly, efficient, and intuitive interface has the following attributes:

• Clarity: the interface should let users interact with the website or application without confusion. Language and flow should be unambiguous, and interface metaphors (visual cues like a folder or bookmark icon) should be unmistakable.
• Concision: while things should be clear, strive to be succinct.
• Usable: a good interface lets users accomplish the tasks they want to perform easily.
• Desirable: the interface should be aesthetically pleasing and attractive enough to capture users’ attention.
• Findable: the interface should be easy to navigate, so users can find the information they want.
• Accessible: the interface should support enlarged text without breaking, and it should be accessible to all users, including people with disabilities.
• Credible: company details and relevant security details should be visible to users to build trust.
• Valuable: the end user should derive value from the UI.

Principles of habit formation

Continued use of an interface causes users to develop habits. It’s on designers to create interfaces where those habits don’t cause problems. They can do this by understanding users’ habits and designing interfaces that encourage better practices. Designers should also be wary of making unconscious assumptions about how users will interact with the interface.

UI vs. user experience (UX) design

User interface design involves developing the buttons, icons, screens, and visual elements that make it possible to interact with apps and websites or control devices intuitively. UI design pays attention to the quality of the user’s interaction with the product and uses artistic design components to enhance its look and feel.

UI is distinct from user experience (UX) design, which focuses on the purpose and functionality of the product. User experience designers conduct market research, identify user needs, and create user journey maps to analyze how customers interact with the product, ensuring it’s functional, accessible, and enjoyable.

While UI is mainly concerned with visual appeal and is almost exclusive to digital products, UX design covers the functionality and usability of a product—whether digital or physical.

Why is user interface important?

Strong UI design contributes to a positive user experience, differentiating your brand from competitors and helping you reap the following benefits.

Attracting new users

Customers want UI design that eases their work and helps them accomplish their tasks. If they’re looking for information, they’ll opt for web content that’s well-labeled, structured, and organized for easy access. They’re also more likely to choose apps they can navigate without much help.

Organize content logically so users can navigate the site with minimal effort. A business that invests in good UI can attract and acquire new customers.

Increasing user engagement

Engaging customers and informing them about your product is hard. Customers leave a page within seconds if something puts them off. A good interface design curbs sudden disinterest through colors, images, fonts, and other enhancements. Higher engagement also raises your chances of converting leads into customers.

Saving future development costs

Getting your UI design right the first time saves time and money later. Also known as the first-time-right principle, validating design choices and correcting navigation mistakes up-front leads to a higher-quality product.

Spending less on customer support

A simple, functional interface reduces customer complaints and the costs that come with them. When your UI is interactive and intuitive, users have fewer doubts and navigate the product more easily, so they need less support.

Improving productivity

An appealing, easy-to-use interface saves users’ time by letting them fulfill their needs quickly. They’re more likely to use the product again. That loyalty helps the business increase sales and—coupled with savings on customer support—realize higher profits.

Building and establishing trust in the brand

Your UI plays a huge role in how potential and existing customers see your brand. Inconsistencies between your online and offline presence can make customers uneasy about purchasing online. A sophisticated brick-and-mortar store paired with a slow, visually unappealing app creates dissonance.

Your brand may also exist only online, making the UI your customers’ entire brand experience. Issues like bugs, device-specific design errors, misalignments, or poor performance will lower your brand’s standing—or cause customers to dismiss it entirely.

Types of user interface

The various types of user interfaces include:

• Graphical user interface (GUI): graphical representations on digital control panels that let users perform functions. Icons, cursors, and dialog boxes are graphic elements that allow users to interact with software.
• Command line interface: a text-based interface where users deliver commands via text for the operating system to execute.
• Menu-driven interface: provides a list or menu of command options to choose from. ATMs are a classic example.
• Touch user interface: a graphical user interface controlled with fingers or a stylus. Smartphones and tablets are typical examples.
• Voice user interface (VUI): lets users give voice commands to devices through speech recognition. Siri, Alexa, and Google Assistant are well-known examples.
• Form-based user interface: gives the user a form-like structure to enter relevant information, after which the system takes the next steps.
• Natural language user interface: lets the user and system communicate through human language. The user inputs speech or text, and the system formulates a response delivered through speech or text—AI chat assistants are a familiar example.

Examples of strong UI

While there are many user interfaces around, the most common examples include:

• Graphical UIs: the UI of choice for most computers. Users no longer have to input text commands and wait for the operating system to execute them.
• Mobile UIs: usable interactive interfaces designed for smaller screens, such as smartphones and tablets, with features like touch controls.

How to create excellent user interfaces

Creating good user interfaces takes several steps. Here are some tips for building a compelling one:

• Make the interface user-focused—design against data rather than intuition.
• Ensure sufficient contrast between text and background color.
• Make the interface adaptable (responsive) to all screens, large or small.
• Experiment with different designs to determine which fits best.
• Make the interface easy to use and navigate, even for first-time users.
• Keep the design consistent—give all pages the same layout to avoid confusing the user—and make sure your brand elements are recognizable throughout.
• Make text readable by aligning text edges and keeping a limited color palette. Choose a font that’s easy to read.
• Proofread to get rid of any errors.
• Provide interaction feedback (such as progress bars or error messages) so users can figure out what to do next.
• Ensure buttons, toggles, and other elements function as users expect, based on standard conventions.
• Use interactive elements sparingly—overuse can discourage users and detract from their experience.