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💻 What is a Computer?

A computer is an electronic device that can store, retrieve, and process data. It follows instructions (called programs) to perform a wide variety of tasks, such as calculations, word processing, internet browsing, playing music, and much more.

🔧 Basic Parts of a Computer

Hardware – The physical parts of the computer.
- CPU (Central Processing Unit): The brain of the computer that processes data.
- Monitor: Displays the output (like a screen).
- Keyboard: Used to input text and commands.
- Mouse: Used to point and click on items.
- RAM (Memory): Temporary storage the computer uses while working.
- Hard Drive / SSD: Permanent storage for data and programs.
Software – The programs and operating systems that run on the computer.
- Operating System (OS): Manages hardware and software (e.g., Windows, macOS, Linux).
- Applications: Programs like MS Word, browsers, games, etc.

🖥️ Types of Computers

Desktop: A personal computer for regular use.
Laptop: Portable and battery-powered computer.
Tablet/Smartphone: Touchscreen devices with computing power.
Server: Powerful systems that store and manage data for other computers.

📚 Basic Computer Operations

Input: Entering data using devices like keyboard/mouse.
Processing: The CPU processes the input data.
Storage: Saving the data in memory or disk.
Output: Displaying results using a monitor or printer.

🌐 Common Uses of Computers

Studying and learning
Office work (documents, spreadsheets)
Internet browsing and communication (email, social media)
Gaming and entertainment
Programming and software development

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Advanced Excel Formulas List PDF Free Download Top 50 Advanced Excel Formulas List No. Formula Purpose/Description 1 SUM() Adds numbers 2 SUMIF() Sums numbers based on one condition 3 SUMIFS() Sums numbers based on several criteria 4 AVERAGE() Calculates average 5 AVERAGEIF() Average based on one condition 6 AVERAGEIFS() Average based on multiple conditions 7 COUNT() Counts numeric cells 8 COUNTA() Counts non-empty cells 9 COUNTIF() Counts based on one condition 10 COUNTIFS() Counting based on multiple conditions 11 MAX() Returns the largest value 12 MIN() Returns the smallest value 13 IF() Logical condition (True / False) 14 IFERROR() Replaces errors with a custom value 15 IFS() Multiple conditions in one formula 16 VLOOKUP() Lookup value vertically from table 17 HLOOKUP() Lookup value horizontally from table 18 XLOOKUP() Advanced and improved version of VLOOKUP 19 INDEX() Returns the value from a specific row & column 20 MATCH() Returns the position of a value

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