Sanity testing:Sanity testing is testing the application to 
ensure, if it is stable enough to continue further 
testing.If the test fails ,we cannot continue testing 
further.Sanity testing is the initial test after the build 
release.It is done by the QA team.


Smoke testing:This is done by the developers , to ensure 
that the build is ready for release to the testing team.

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Smoke testing is done to ensure that build is stable and 
key features r working porperly without going in depth.

Sanity testing is subset of regression testing and it is in 
testing the build in depth.
e.g For login screen 
Smoke testing is only test whether user is able to login
and Sanity testing is to test text field lenght,datatype of 
text,which page it takes.

Smoke Testing is build is stable or not.It is done by dev. 
side.
Sanity Testing is product is stable or not.It is done by QA
(Tester)
Saroj Kumar Sahoo

smoke testing: It is performed by developers before 
releasing the application to testing team.In this they 
verify basic functionality of an application

sanity testing: After receiving the application test 
engineer VALIDATES basic functionality of an application 
with help of checked list to estimate stability.

Ex: For login screen 
Smoke testing is only test whether the user is able to 
login or not .
And Sanity testing is to test text field lenght,datatype of 
text,which page it takes