Load testing -Load testing is a test whose objective is to 
determine the maximum sustainable load the system can 
handle. Load is varied from a minimum (zero) to the maximum 
level the system can sustain without running out of 
resources or having, transactions suffer (application-
specific) excessive delay.

Stress testing - Stress testing is subjecting a system to 
an unreasonable load while denying it the resources (e.g., 
RAM, disc, mips, interrupts) needed to process that load. 
The idea is to stress a system to the breaking point in 
order to find bugs that will make that break potentially 
harmful. The system is not expected to process the overload 
without adequate resources, but to behave (e.g., fail) in a 
decent manner (e.g., not corrupting or losing data). The 
load (incoming transaction stream) in stress testing is 
often deliberately distorted so as to force the system into 
resource depletion. 

Performance testing - Validates that both the online 
response time and batch run times meet the defined 
performance requirements.

Load Testing : to check the performence of an application
based on increasing no.of vusers.

Stress Testing : to check the performence of an application
based on increasing no.of resources.

Performence Testing : To check whether our application is
giving response with in the expected time or not. 

if any wrong make me to know.

Load Testing:
-------------
--> It is the process of creating demand on a system or 
device and measuring its response.
--> It generally refers to the practice of modelling the 
expected usage of a software program by simulating multiple 
users accessing the program's services concurrently.
Performance testing:
-------------------
--> Validates that both the online response time and batch 
run times meet the defined Performance requirements.
Stress Testing:
---------------
--> Testing conducted to evaluate a system or component at 
or beyond the limits of its specified requirements to 
determine the load under which it fails and how.
--> Often this is performance testing using a very high 
level of simulated load.

load testing:- testing an application under heavy loads,
such as testing of a web site under a range of loads to
determine at what point the system's response time degrades
or fails.

performance testing:- testing to ensure that the application
responds in the time limit set by the user. if this is
needed, the client must supply the benchmarks to measure by
& we must have a hardware environment that mirrors production.

stress testing:- subject the system to extreme pressures in
a short time-span is stress testing.

The execution of a software under customer expected 
configured environment and customer expected load  to   
estimate speed of processing is called as load testing.

 The execution of a software under customer expected 
configured environment and customer expected load 
continously to estimate longuity or durability called as 
endurance testing.

The execution of a software under customer expected 
configured environment and more customer  load  to   
estimate peak load(maximum load) called as stress testing.

Performance testing = load testing+endurance testing+stress 
testing

Load  testing is testing an application under heavy loads it
measurements stability and responsiveness through put the
application. 

Stress testing is How heavy a load the application. 


Performance testing check whether our application is
giving response with in the expected time or not.

Performance testing is testing that is performed to 
determine how fast some aspect of a system performs under a 
particular workload.

Performance testing

 Combination of load and stress is known as performance testing.
Load testing

     By increasing the number of user the system performance
should not affect.
Stress Testing

Checking UN estimated condition.By increasing the number of
user what time the system point degrades.