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.
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.
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 HTTPheader 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/118.0.0.0 Safari/537.36
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.
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.
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.