A. integration testing:testing of combined parts of an 
application to determine if they function together 
correctly. The 'parts' can be code modules, individual 
applications,client and server applications on a network, 
etc. This type of testing is especially relevant to 
client/server and distributed systems.


System Testing:system testing will conducted on the entire 
system to check whether 
it is meeting the customer requirements r not

Integration Testing;

The unit tested module has to be integrated to build the 
application.

For Eg: When we test the With draw and Deposit option after 
integrating both the functionality it is the integration 
testing

where as System Testing involves testing the entire 
functionality of the application.

EG; Testing the all the functionalities in Banking

intergration testing means data flowing between 2 modules.

system testing means end to end testing done by end user 
and testing engineer.

integration testing is performed when any of the two or more
components are joined together to work as one. it may be
integration of two systems or two modules or so. in case of
integration testing we test that are those components
capable of working together. In case of integration testing
interfaces of joined components is given more importance. it
is checked that the data flow b/w the components is correct
and their shld be no leakage at the interface and so on.
But in case of system testing we test the sys as whole for
both its functional and non functional requirements.

Integration Testing:
its the process of testing that the testing conducts at 
the  combination of all modules of the application to check 
app behaves as per the requirement
ex: 1.Dataflow
    2.comined modules
system Testing:
its the process of testing to check entire application that 
if the app behaves as per the requirement
ex: 1.end to end testing
    2.site testing
    3.menu testing
    4.navigation testing 
in system testing it covers all the functional and non-
functional and usability testing.
f.testing is +ve,-ve,valid,invalid,within range,without 
range.
non.f.t is 
relibility,compatability,configuratation,installation,datavo
lum testing....
usabulity testing is userinterface and manual supported 
testing.