ICDL Computer & Online Essentials (ICDL) study guide
ICDL Computer & Online Essentials · Work through your exam, one topic at a time.
Computer & Online Essentials is one of ICDL's Digital Student modules - a certification of the foundational digital skills a learner needs to use a computer safely and effectively in a modern learning environment and, later, in the workplace. ICDL describes the module as covering the main concepts and skills for using computers and devices, file and application management, networks, online information, online communication, and safety. The ICDL Computer & Online Essentials study guide has 4 sections and about 1,381 words.
01Computers and Devices
Every digital device - desktop, laptop, tablet, smartphone, smartwatch - follows the same basic pattern: data enters through input devices (keyboard, mouse, touchscreen, microphone, scanner), the CPU processes it, results leave through output devices (screen, printer, speakers), and anything kept for later goes to storage . The distinction candidates most often trip on is memory versus storage.
360 words, about 2 min02Networks
A network is two or more devices connected so they can share files, printers and an internet connection. A LAN (local area network) covers one building or site; a WAN (wide area network) spans cities or countries, and the internet is the largest WAN of all.
350 words, about 2 min03Online Communication
Online communication splits into synchronous tools, where people take part at the same time (instant messaging, chat, VoIP calls, video conferencing), and asynchronous tools, where replies come later (email, forums, discussion boards, comments). Matching the tool to the task is a favourite exam theme: a quick question to a colleague suits chat; a formal record or a file for review suits email.
342 words, about 2 min04Safety and Security
Security questions reward precision about what each defence actually does. Authentication proves who you are: a strong password (long, unique, not a dictionary word) plus, ideally, two-factor authentication , which adds a second proof such as a code on your phone.
329 words, about 2 min