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What is a black hole? How can we understand it?
A black hole is a region of space where gravity is so strong that nothing not even light can escape. It forms when an extremely massive star collapses at the end of its life. The core compresses to an almost infinitely dense point called a singularity.The boundary beyond which nothing can return is called the event horizon. It is not a physical surface it is a point of no return.Simple analogy: imagine a rubber sheet pulled tight. Place a bowling ball on it the
What is CRM?
CRM stands for Customer Relationship Management both a business strategy and the software that implements it.As software, a CRM is a central platform storing all customer data: contact information, purchase history, complaints, sales conversations, contracts, and support tickets. Everyone in the company sales, marketing, support works from the same system.Core benefits:No information gets lost whe
What is Linux?
Linux is a free, open-source operating system kernel created by Linus Torvalds in 1991. An operating system manages your computer's hardware and lets software run on top of it.Because the source code is open, anyone can use, modify, and distribute it. This led to hundreds of Linux distributions (distros):Ubuntu: beginner-friendly, popular for desktops and servers<li data-list-item-id="ed4531f0590a07
What is Snowflake?
Snowflake is a cloud-based data warehouse platform where organisations store, manage, and analyse very large amounts of data.A regular database handles today's operational data current orders, active customers. A data warehouse stores historical data at massive scale and runs complex analytical queries across it "what were sales trends across all regions for the last five years?"What makes Snowflake distinctive:<li data-list-item-id="e1390ced2238715dde3f
What is a virtual machine?
A virtual machine (VM) is a software simulation of a complete computer. It runs inside another computer as an application, but from the inside behaves exactly like a real, separate machine — with its own OS, files, and network settings.Your physical computer runs Windows. A VM app (VirtualBox, VMware, Parallels) creates a sandboxed environment where Ubuntu Linux runs simultaneously. The two systems do not interfere.Why use VMs:<li data-list-item-id="e6b4
What is PHP and how can one learn it?
PHP is a programming language designed specifically for building web pages and web applications. It runs on a server, generates HTML, and sends it to the browser. Users never see PHP code only its output.Who uses PHP: WordPress (powers ~40% of all websites) is built in PHP. Facebook was originally PHP. The popular Laravel framework is PHP-based.How to learn it:Learn basic HTML and
What is Raspberry Pi?
A Raspberry Pi is a very small, very cheap, fully functional computer built on a single circuit board about the size of a credit card. Created by the Raspberry Pi Foundation in the UK to make computing education affordable.It has a processor, RAM, USB ports, HDMI, Wi-Fi, and Bluetooth. Plug in a keyboard, mouse, and monitor it works like a basic desktop. Runs Linux.Common uses:Learning programming and electronics<
What is Docker?
Docker packages an application and everything it needs to run code, libraries, settings, environment into a single unit called a container.The problem it solves: software works on one machine but fails on another because of different operating system versions, library versions, or settings. This is the classic "it works on my machine" problem.A Docker container includes everything the app depends on, so it runs identically on any machine with Docker installed.Cont
What is DSA (Data Structures and Algorithms)?
DSA is the study of how to organise data efficiently and write procedures that solve problems as quickly and with as little memory as possible.Data structures ways of storing and organising data:Array: Numbered list; fast to access by positionStack: Last in, first out (like a stack of plates)<li data-lis
What is SQL?
SQL stands for Structured Query Language the language used to store, retrieve, update, and delete data in databases.Most businesses store data in relational databases (MySQL, PostgreSQL, Microsoft SQL Server), which organise data into tables with rows and columns. SQL is how you talk to those tables.The four core operations:SELECT — retrieve data<li data-list-item-id="e54d417c354cbb2f8a
What is Agile?
Agile is a way of managing projects especially software development by delivering work in short cycles instead of planning everything upfront and delivering at the end.Before Agile, teams spent months planning, months building, months testing before anyone saw a working product. If the plan was wrong, everyone found out too late.How Agile works: work is divided into short periods called sprints (usually two weeks). At the end of each sprint, the team delivers so
What is Salesforce?
Salesforce is the world's most widely used CRM (Customer Relationship Management) platform software that helps businesses track every interaction with their customers.Every salesperson, support agent, and manager can see the same up-to-date picture of any customer: sales calls, emails, complaints, purchases, support tickets, and open deals.Salesforce includes:Sales Cloud: leads, opportunities, pip
What is a port number?
A port number lets your computer handle many types of network communication simultaneously by labelling each type with a number.Your IP address is like a building's street address. Port numbers are like apartment numbers they tell the operating system which program should receive incoming data.Common standardised ports:Port 80: regular web (HTTP)<li data-list-item-id="e366b69e21d1d8f805f47f31
What is an API?
API stands for Application Programming Interface a defined set of rules that lets two pieces of software talk to each other.Think of a restaurant: you do not walk into the kitchen and cook. You give your order to a waiter (the API), the kitchen (server) prepares it, and the waiter brings the result. You never need to see the kitchen.When a weather app shows today's temperature, it sends a request to a weather service's API "give me the temperature for London" and the API returns
What is OOP?
OOP stands for Object-Oriented Programming a way of writing code by organising it around "objects" rather than a long list of instructions.An object bundles together data (properties) and actions (methods). A "Car" object has properties like colour and speed, and methods like accelerate() and brake().OOP is built on four ideas:Encapsulation: keep an object's data pri
What is the difference between a local IP and a static IP?
Local IP (private IP): the address your device gets inside your home or office network, assigned by your router. It only works within that network — no one on the internet can reach your device using it. Typical format: 192.168.x.x or 10.x.x.xStatic IP: an IP address that
What is the difference between a static IP, residential IP, and a normal country VPN?
TypeChanges?Looks like?Best forStatic IPNeverA business or serverHosting, remote accessResidential IPCan varyA real home userBypassing anti-bot systemsCountry VPNYes, but predictableA data centrePrivacy, geo-unblocking<li data-list-item-id=
How does the Apple Neural Engine actually work?
The Apple Neural Engine (ANE) is a dedicated chip inside Apple's A-series and M-series processors designed to run machine learning tasks extremely fast while using very little power. It is separate from the CPU and GPU.Machine learning tasks involve one type of calculation repeatedly: multiplying large matrices of numbers together. A general CPU does this slowly because it handles many task types. The ANE does only this but does it at trillions of operations per second (TOPS).Te
How does browser fingerprinting work?
When you visit a website, JavaScript on the page queries your browser for detailed information:Canvas fingerprint: your graphics card renders an invisible image; tiny differences in how hardware renders it create a unique IDAudio fingerprint: your audio system is queried similarly<li data-list-item-id="edd951cc36eccca90f0cf30b1
What is a browser fingerprint? How do I avoid it?
A browser fingerprint is a profile of your device built from information your browser freely shares with every website without cookies. Websites collect your screen resolution, installed fonts, browser version, operating system, graphics card behaviour, time zone, language settings, and more. Together, these points identify you uniquely among millions of users.To reduce fingerprinting:Use Tor Browser it normali
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