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U is for user experience

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universal design
Universal design is the design of buildings, products, or environments to make them accessible to people, regardless of age, disability, or other factors.
It addresses common barriers to participation by creating things that can be used by the maximum number of people possible.
In recent years, universal design principles have found their way to the Web where numerous web developers have begun to apply them to the design of web applications.
Source: Universal design
universally-unique identifier (UUID)
A Universally Unique Identifier (UUID) is a 128-bit label used for information in computer systems. The term Globally Unique Identifier (GUID) is also used, mostly in Microsoft systems.
When generated according to the standard methods, UUIDs are, for practical purposes, unique. Their uniqueness does not depend on a central registration authority or coordination between the parties generating them, unlike most other numbering schemes. While the probability that a UUID will be duplicated is not zero, it is generally considered close enough to zero to be negligible.
Thus, anyone can create a UUID and use it to identify something with near certainty that the identifier does not duplicate one that has already been, or will be, created to identify something else. Information labeled with UUIDs by independent parties can therefore be later combined into a single database or transmitted on the same channel, with a negligible probability of duplication.
Source: Universally unique identifier
user agent
A user agent (UA) is a computer program representing a person, for example, a browser in a Web context.
Besides a browser, a user agent could be a bot scraping webpages, a download manager, or another app accessing the Web. Along with each request they make to the server, browsers include a self-identifying User-Agent HTTP header called a user agent (UA) string [of characters]. This string often identifies the browser, its version number, and its host operating system.
For example:
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/ Safari/537.36
Source: User agent
user agent stylesheet
A user agent stylesheet is a pre-defined set of CSS rules that are built into a web browser and applied to web pages automatically.
The purpose of the user agent stylesheet is to provide a consistent and standardized visual rendering of HTML elements across different web pages and websites.
The rules in the user agent stylesheet define how HTML elements should be displayed by default, including things like font size, color, spacing, and alignment.
Check out also Browser Default Styles.
Source: What is a User Agent Stylesheet?
User Experience (UX)
User Experience (UX) is how a user interacts with and experiences a product, system or service. It includes a personʼs perceptions of utility, ease of use, and efficiency.
Improving user experience is important to most companies, designers, and creators when creating and refining products because negative user experience can diminish the use of the product and, therefore, any desired positive impacts; conversely, designing toward profitability often conflicts with ethical user experience objectives and even causes harm.
User experience is subjective. However, the attributes that make up the user experience are objective.
Source: User experience
User Interface (UI)
User Interface (UI) is anything that facilitates the interaction between a user and a machine. In the world of computers, it can be anything from a keyboard, a joystick, a screen, or a program.
In case of computer software, it can be a command-line prompt, a webpage, a user input form, or the front-end of any application.
Source: UI

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