1. What is Apache JMeter?
Apache JMeter is an open-source performance testing tool used to check how well a website or application performs under heavy load.
Example:
1 user opens website → Works fine
1,000 users open website → Slow? Crash?
JMeter helps you find this before real users face it.
Real-Time Example — Apache JMeter
Example: Flipkart Big Billion Days Sale
During Big Billion Days:
Lakhs of users open Flipkart at the same time
Users try to login
Add products to cart
Make payment
What can happen without testing:
Website becomes slow
Login fails
Payment fails
Website crashes
This leads to:
Customer frustration
Company loss
Bad user experience
How JMeter is Used:
Before the sale, developers use JMeter to simulate:
1,000 users
5,000 users
10,000 users
Then they check:
Website speed
Server performance
Response time
Errors
If website crashes at 8,000 users
Breaking point = 8,000 users
Then developers:
Increase server capacity
Optimize code
Improve performance
3. Why Companies Use JMeter:
Free (Open source)
Easy to use
Supports API testing
Supports web testing
Supports performance testing
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