Functional and Non-Functional Testing.

Difference between functional and non functional testing:
The requirement function of an application is checked in functional testing.
where in Non-functional testing test the behavior of application from maximum capacity of application as follows by using these testing type.

->performance testing is done by the following type:

load testing
security testing
volume testing
stress testing
LOAD TESTING:

Used to identify the maximum operating capacity of application in normal(100 to more) and peak load condition(1000 to more).
SECURITY TESTING:

Security testing is an important one of software testing focused on identifying and addressing security in a software applications like authentication and authorization to ensure that the software is secure from unauthorized access, and data loss.
VOLUME TESTING:

How does application behaves when extreme amount of data given to system to improve system performance in term of large database or software.

STRESS TESTING:

Determines the behavior of the system and Ensure failure does not cause security issues Makes system function in every situation Stress testing makes the system work in normal as well as abnormal conditions in an appropriate way.
There is also another non-functional testing is portable testing this test is for server to server or one operating system to another operating system to make sure each product it transfer from our end to user end.