General Computer Science Overview

The central processing unit (CPU) is the brain of a computer. It executes instructions, performs calculations, and manages all operations within a computer. It's like the conductor of an orchestra, directing all the different hardware components to work together.

Random Access Memory (RAM) is the computer's short-term memory. It stores data and programs that are currently being used by the computer. Think of it as the desk where you keep your current work. Once you turn off the computer, everything in RAM gets erased.

An operating system (OS) acts as the intermediary between the user and the computer's hardware. It manages resources like memory, storage, and input/output devices, and provides a platform for software to run on. It's like the air traffic controller of the computer, managing all the activities.

A stack follows the Last In, First Out (LIFO) principle. Imagine a stack of plates. The last plate you put on the stack is also the first one you take off. The same applies to data stored in a stack.

A queue follows the First In, First Out (FIFO) principle. Think of a line at a store. The first person in line is the first one to be served. Data in a queue is processed in the same way.

A primary key in a database is a unique identifier for each record. It's like a social security number that distinguishes each person in a database. Every record must have a unique primary key.

Structured Query Language (SQL) is a special language used for interacting with databases. It's used to manage, query, and manipulate data in a database, like adding, deleting, or updating records.

Phishing is a type of cyberattack where attackers try to trick you into giving them your sensitive information, like passwords or credit card details. They often do this through fake emails or websites that look legitimate.