Latest Questions 214 total
0
0
answers
181How many months does it take to learn full stack development?
Timeline to become job-ready in full stack:
**With dedicated learning (6-8 hours/day):**
- HTML/CSS/JS basics: 1 month
- React (frontend): ...
0
0
answers
182What is the average salary for a data science fresher in India 2025?
For freshers in India (2025 data):
- **Entry level (0-1 year):** ₹3.5 – ₹7 LPA
- **Junior Data Scientist (1-3 years):** ₹6 – ₹1...
0
0
answers
183How to get a data science job with no experience?
Getting your first data science job without experience is challenging but very doable. Here's a proven roadmap:
1. **Build skills** — Pyt...
0
0
answers
184What is Docker and why do developers use it?
Docker is a containerisation platform that packages your application and all its dependencies into a portable container.
**Why use it:**
- ...
0
0
answers
185What is the difference between AWS EC2 and Lambda?
**EC2 (Elastic Compute Cloud):** Virtual servers you manage
- You control OS, software, scaling
- Always running → pay for uptime
- Best f...
0
0
answers
186What is Node.js and why is it used?
Node.js is a JavaScript runtime built on Chrome's V8 engine that lets you run JavaScript on the server side.
**Why use it:**
- **Non-blocki...
0
0
answers
187What is the difference between SQL and NoSQL databases?
**SQL (Relational):** MySQL, PostgreSQL, SQLite
- Structured tables with fixed schema
- ACID compliant (reliable transactions)
- Best for co...
0
0
answers
188What is REST API and how does it work?
REST (Representational State Transfer) is an architectural style for building APIs.
Key principles:
- **Stateless** — each request is ind...
0
0
answers
189What is the difference between React and Angular?
| Feature | React | Angular |
|---|---|---|
| Type | Library | Full framework |
| Language | JavaScript | TypeScript |
| Learning curve | Mo...
0
0
answers
190What is the difference between correlation and causation?
**Correlation** — two variables change together (positive or negative relationship)
**Causation** — one variable directly causes the cha...
0
0
answers
191What is Pandas and how is it used in data science?
Pandas is a Python library for data manipulation and analysis. It provides two main data structures:
**Series** — 1D labelled array
**Dat...
0
0
answers
192What is feature engineering in machine learning?
Feature engineering is the process of using domain knowledge to create, transform, or select input variables (features) that help ML models ...
0
0
answers
193What is the difference between mean, median, and mode?
**Mean** — sum divided by count. Sensitive to outliers.
**Median** — middle value when sorted. Robust to outliers.
**Mode** — most fre...
0
0
answers
194What is the data science lifecycle?
The data science lifecycle has 6 stages:
1. **Business Understanding** — define the problem
2. **Data Collection** — gather relevant da...
0
0
answers
195What is overfitting and how do you prevent it?
Overfitting occurs when a model learns the training data too well (including noise), so it performs poorly on new data.
**Signs:** High tra...
