What is difference UTP in testing ?

UTP (Unit Test Plan) are done at smallest unit level or stand alone mode.
UTP can be done using NUNIT.
Unit testing is done normally by developers.

UTP are done on small un it level or at stand alone mode.(Unit Test Plan)  UTP can be done using NUNIT. 

There is a difference between Unit test cases and Unit Test plan .
- A unit test case is a developper test using Frameworks , in Java for example you can use JUnit , or Arquillian.
- Unit Test Plan is a document to discribe how you can test a specification of software specification document .
in UTP we use a a tool for example TestLink to manage test plans and test cases.