Summary of Essential Concepts in Information Technology

## Introduction Computers rely on two main components: **hardware** (the physical parts you can touch) and **software** (the programs and applications that run on the hardware). This guide explains essential hardware parts such as storage, CPU, and RAM, and important software concepts like application types, bugs and updates, compatibility, cloud apps, and accessibility tools. The material is arranged for self-learning with clear definitions, examples, comparisons, and practical tips. > **Definition:** Hardware refers to the physical components of a computer system such as the CPU, RAM, storage devices, motherboard, and peripherals. > **Definition:** Software refers to programs and applications that instruct the hardware what tasks to perform, including operating systems, application software, and utilities. ## Storage, CPU and RAM ### Storage (HDD / SSD / External) - **What it is:** Long-term space where files and programs are saved. - **Common problems:** Not enough free space to save files or install programs. - **Typical solutions:** - Compress files to reduce size. - Move files to external storage (USB drive, external HDD/SSD). - Upgrade to a larger HDD or SSD. Practical example: If your laptop has a 256 GB SSD and you need more space for videos, move raw video files to an external 2 TB HDD or upgrade the internal SSD to 1 TB. > **Definition:** SSD (Solid State Drive) is a storage device with no moving parts, faster and more reliable than HDD (Hard Disk Drive), which uses spinning platters. ### CPU (Central Processing Unit) - **What it is:** The CPU executes instructions and processes data — the "brain" of the computer. - **Common problems:** Overheating which can cause slowdowns or crashes. - **Typical causes of overheating:** Faulty cooling systems, broken fans, dried thermal paste between CPU and heatsink. - **Solutions:** 1. Clean or replace fans and heatsinks. 2. Reapply thermal paste correctly. 3. Ensure adequate airflow in the case. Practical example: If your desktop frequently shuts down during heavy use, check CPU temperatures in BIOS or a monitoring app; if high, inspect the fan and heatsink for dust and reseat or replace them. > **Definition:** Thermal paste is a compound applied between the CPU and heatsink to improve heat transfer. ### RAM (Random Access Memory) - **What it is:** Short-term memory used by the CPU to run active programs and processes. - **Common problems:** System instability, crashes or failure to boot. - **Typical causes:** Incorrect installation, using wrong memory slots, incompatible modules, or cooling issues. - **Solutions:** - Reseat RAM sticks ensuring they click into place. - Install RAM in correct slots per motherboard manual (for dual-channel setups there are specific pair slots). - Replace faulty modules. Practical example: If a PC beeps at startup or does not pass POST, try removing and reinstalling RAM sticks one at a time to identify a bad module. ## Application Software - **What it is:** Programs that let users perform specific tasks (e.g., word processing, spreadsheets, design). - **Types and examples:** - **Collaboration software:** multiple users edit the same document simultaneously — Microsoft 365, Google Workspace, Trello, Slack, Canva. - **Communication software:** email, messaging, video conferencing — Outlook, Gmail, WhatsApp, Telegram, Teams, Zoom. Practical example: Use Google Docs for group assignments to enable real-time coediting and version history. > **Definition:** Collaboration software enables real-time or asynchronous teamwork on shared documents and projects. ## Software Bugs and Updates - **Software bug:** An error or flaw in program code that causes incorrect or unexpected behavior. - **Beta testing:** Pre-release testing by users to find bugs before final release. - **Updates:** Provide bug fixes, security patches, and new features; users should install updates regularly. Practical tip: Enable automatic updates