The power supply unit. Converts AC power from your wall outlet to DC power the computer components need.
For getting physical copies of documents and photos. All-in-one models can Scan and Copy too.
A tool for easily installing, updating, and managing software. Essential for Linux users.
Captures an image of your screen and copies it to the clipboard. Very useful for sharing!
Dividing a physical drive into separate logical drives, each with its own filesystem.
A virtual endpoint for network communication. Different services use specific port numbers, like 80.
The percentage of data packets that get lost in transit. Can noticeably degrade voice and video quality.
An encrypted vault for storing and generating strong passwords. Way better than using the same password everywhere.
Options to control how your data is collected and used. Review them in your OS, browser, and apps.
Tricking people into revealing sensitive info by posing as a trusted entity. Be wary of emails asking you to log in or download attachments.
A secret phrase that grants access to an account. The longer and more random, the better.
Settings that control what a user can access and modify. Useful for locking down sensitive files.
Features that restrict content and computer use. Handy for protecting kids online.
Completely shut down the device, wait a minute, then start it back up. Fixes a surprising number of issues.
A percentage is a number that shows what fraction of another number it is, also called a percent or percentage rate. It's a commonly used way to express ratios in math and everyday life, making it easier to compare different data.
Plato (English: Plato, Ancient Greek: Πλάτων, 427 BC (or 428 BC) – 347 BC), originally named Aristocles, was a man born in Athens. He was a great philosopher, thinker, educator, and mathematician of ancient Greece, the founder of Western objective idealism, and one of the greatest philosophers and thinkers in Western culture.
The Platonic solids are the five most perfect 3D shapes in mathematics, also called regular polyhedra. They are the tetrahedron, cube, octahedron, dodecahedron, and icosahedron. Each face of these solids is exactly the same regular polygon, and the number of faces meeting at each vertex is also the same.
The Prime Meridian is the 0° longitude line on Earth, located at the old site of the Royal Observatory in Greenwich, London. It was established as the global reference point for longitude and time calculation at the international conference in 1884.
A ratio is an expression that shows two ratios are equal, and in everyday life, it also refers to the proportion of a part to the whole.
Ratios are general multiplicative relationships, while percentages are a special type of ratio with the denominator fixed at 100. The main differences lie in how they're written, the base number, and their use. Both can show quantity relationships, but percentages make it easier to intuitively compare different data.
A proportionality constant is a fixed number in math and physics formulas that links two variables. It's usually represented by the letter k and determines how the variables change in relation to each other or multiply together.
The Pythagorean theorem is the same as the right triangle theorem, which means the sum of the squares of the two legs of a right triangle equals the square of the hypotenuse. The formula is a² + b² = c². This theorem is one of the most basic rules in geometry and is used to calculate the relationship between the sides of a right triangle, playing an important role in both Western and Chinese math history.
"Representing data" usually means converting real-world information into a binary form that computers can store, process, or transmit, focusing on encoding and structured expression; in a math or statistics context, it refers to presenting data features using lists, charts, or formulas.
A pie chart is a type of chart that uses the area of circular sectors to show the proportion of data, often used to see how each part contributes to the whole, like market share or budget allocation.
Product design is a comprehensive field and hands-on activity that combines art, technology, business, and humanities. It's basically the process from setting design tasks to producing prototypes, aiming to solve user problems through innovation while creating business and social value.
A polygon is a closed shape made up of three or more line segments connected end to end. Depending on different criteria, it can be divided into regular and irregular polygons, as well as convex and concave polygons.
It's a number used to show how likely something is to happen. For a random event A, its probability is denoted as P(A).
"Probability levels" usually refer to the qualitative or quantitative grading of how likely an event is to happen in risk assessment, reliability engineering, or safety analysis (commonly from levels 1–5 or A–E), but the exact divisions vary by industry/standard, and there's no unified global standard.
A probability distribution is a complete mathematical description of all possible values a random variable can take and their corresponding probabilities. It reveals the statistical patterns behind random events and is the foundation of probability theory and statistics.