Latest Questions 84 total
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31What is the difference between Azure VM and Azure App Service?
**Azure Virtual Machine (VM):**
- Full control over OS, software, configuration
- You manage OS updates, security patches
- Best for: legacy...
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32How to pass the AWS Solutions Architect Associate exam?
The AWS SAA-C03 exam has 65 questions in 130 minutes. Here's the proven study plan:
**6-Week Plan:**
Week 1-2: Core services
- EC2 (instan...
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33What is the difference between AWS RDS and DynamoDB?
**RDS (Relational Database Service):**
- Managed SQL databases: MySQL, PostgreSQL, Oracle, SQL Server
- Structured data with fixed schema
- ...
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34What is AWS IAM and why is it important?
IAM (Identity and Access Management) controls **who can do what** in your AWS account.
Key concepts:
- **Users** — individual people with...
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35How does AWS Auto Scaling work?
AWS Auto Scaling automatically adjusts the number of EC2 instances based on demand.
**How it works:**
1. You define a **Launch Template** (...
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36What is the difference between AWS S3 and EBS?
**Amazon S3 (Simple Storage Service):**
- Object storage — stores files, images, backups, static websites
- Accessible from anywhere over ...
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37How to build a RAG chatbot with LangChain and Python?
Here is a simple RAG chatbot using LangChain:
```python
from langchain_openai import ChatOpenAI, OpenAIEmbeddings
from langchain_community....
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38What are the core AWS services every developer should know?
Essential AWS services for developers:
**Compute:**
- EC2 — virtual servers
- Lambda — serverless functions
- ECS/EKS — container orc...
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39What is the difference between ChatGPT, Claude, and Gemini?
All three are large language model (LLM) AI assistants:
| | ChatGPT | Claude | Gemini |
|---|---|---|---|
| Company | OpenAI | Anthropic | ...
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40What is prompt engineering and why does it matter?
Prompt engineering is the practice of designing and optimising text inputs (prompts) to get better outputs from AI language models.
**Why i...
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41How to prepare for a data science interview in 30 days?
**Week 1 — Statistics & Probability**
- Probability distributions, Bayes theorem
- Hypothesis testing, p-values
- A/B testing basics
**We...
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42Most common system design interview questions for software engineers
Top system design questions asked at product companies:
1. **Design a URL shortener** (Bit.ly)
2. **Design Twitter/Instagram** (social medi...
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43What is the difference between useState and useEffect in React?
**useState** — manages state (data that can change over time)
**useEffect** — handles side effects (API calls, subscriptions, timers)
`...
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44What is async/await in JavaScript?
**async/await** is syntactic sugar over Promises that makes asynchronous code look synchronous.
```javascript
// With Promises
fetch('/api/...
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45What is the difference between var, let, and const in JavaScript?
All three declare variables, but with different scope and mutability:
**var:** function-scoped, hoisted, can be redeclared
**let:** block-s...
