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What Is Two-Factor Authentication, and Which Type Should You Use?

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The three categories of authentication factor Three columns showing something you know (a password or PIN), something you have (a phone, hardware key, or passkey), and something you are (a fingerprint or face). Two of the three are required to unlock the account. Text below explains that "two-factor" means two different categories, not two of the same. any two unlocks 1 Something you know • A password • A PIN • A recovery phrase • An answer to a security question Can be stolen, guessed, or reused 2 Something you have • Your phone (SMS, app, push) • A hardware security key • A passkey on your device • A code from an authenticator Requires possessing the device 3 Something you are • A fingerprint • Face recognitio...
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Computer Science Fundamentals in 2026: A Practical Guide

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Grid of connected nodes suggesting layers of computing A dark navy background with three horizontal bands of glowing nodes connected by lines, suggesting layers of a computing system. Original illustration — computer science is a stack of layers, each built on the one beneath it. Computer Science Fundamentals in 2026: A Practical Guide Computer science covers a lot of ground, and most "complete guides" collapse under their own ambition. This one takes a different approach: a clear map of what the field actually contains, what each area does, and how the pieces fit together — without pretending that reading one article makes you an expert. What you will get ...
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Getting Started with Word Introduction

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Diagram of the Microsoft Word window showing its main interface areas A labelled schematic of the Word window. From top to bottom: a title bar containing the Quick Access Toolbar; a row of Ribbon tabs; the Ribbon itself, divided into named groups with a small dialog launcher arrow in one group corner; a horizontal ruler; the document canvas; and a status bar containing page and word counts, view buttons, a zoom slider and the current zoom percentage. Document1 — Word Home Insert Draw Design Layout References Mailings Review View Help Clipboard Font Paragraph Styles Editing ...
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