# Data Processing Methods

How is data actually processed by computers?

## 1. Batch Processing
- Data is collected over time and processed **all at once** (in a batch).
- **Example**: Payroll systems (calculating salaries at the end of the month).
- **Pros**: Efficient for large volumes.
- **Cons**: Not immediate.

## 2. Real-time Processing
- Data is processed **immediately** as it comes in.
- **Example**: ATM withdrawals. You need to know your balance *right now*.
- **Pros**: Instant results.
- **Cons**: Complex and expensive.

## 3. Online Processing
- Similar to real-time, often used for internet applications.
- **Example**: Barcode scanning at a store checkout. The price is fetched instantly.

## 4. Distributed Processing
- Breaking a task into pieces and running them on **multiple computers** at the same time.
- **Example**: Google Search. Many servers work together to find your result.