⚡️ ETL

ETL stands for Extract, Transform, Load.
It is the pipeline that moves and cleans data for analytics.

Core idea: Collect → clean → store.

Where it is used:

🏢 Data warehouses
📊 Business intelligence
🧠 ML feature pipelines
☁️ Cloud data platforms
📈 Reporting systems

It's purpose is to make data reliable and analysis ready.

Simple flow:
1️⃣ Extract from sources
2️⃣ Transform into clean format
3️⃣ Load into destination system

Things to know:

🔁 Modern systems often use ELT
⏱️ Can be batch or streaming
🧹 Data quality checks are critical
📦 Scalability matters at scale

✅ETL = factory assembly line for data.