Callback Hell occurs when multiple asynchronous operations are nested within each other using callbacks, leading to code that's hard to read and maintain. It typically looks like a pyramid or "right-leaning" structure: doSomething(function(result1) { doSomethingElse(result1, function(result2) { moreWork(result2, function(result3) {

MySQL is a popular open-source relational database used for web and enterprise applications. Here’s a quick cheat sheet for essential commands: Connect to MySQL: mysql -u username -p Create Database: CREATE DATABASE db_name; Use Database: USE db_name; Create Table: CREATE TABLE table_name (id INT, name VARCHAR(100)); Insert Data:

Preparing for an Azure DevOps interview? Here are some essential questions to help you crack it: What is Azure DevOps? A set of tools by Microsoft for CI/CD, project tracking, and collaboration. Difference between Azure DevOps Services and Server? Services is cloud-based; Server is on-premises. What are Pipelines in Azure DevOps? Pipelin

A database is an organized collection of data that allows easy access, management, and updating. Used across industries, databases store everything from user information to financial records. They can be relational (like MySQL and PostgreSQL), where data is stored in structured tables, or non-relational (like MongoDB), where data is stored in flexi