Transaction anywhere is used to execute or stop set of statements.

     BEGIN TRANSACTION trans
    BEGIN TRY
    INSERT INTO Department(DeptID,DeptName,Location)VALUES(2,'HR','Delhi')
    INSERT INTO Employee(EmpID,Name,Salary,Address,DeptID)VALUES(1,'Mohan',18000,'Delhi',1)
     IF @@TRANCOUNT > 0
     BEGIN COMMIT TRANSACTION trans
     END
    END TRY
    BEGIN CATCH
     print 'Error Occured'
     IF @@TRANCOUNT > 0
     BEGIN ROLLBACK TRANSACTION trans 
     END
    END CATCH 

Save point is used in transaction  to set data to a particular point . We call it rollback

BEGIN TRY
INSERT INTO Department(DeptID,DeptName,Location)VALUES(2,'HR','Delhi')
IF @@TRANCOUNT > 0
 BEGIN SAVE TRANSACTION trans;
 END
INSERT INTO Department(DeptID,DeptName,Location)VALUES(3,'Admin','Delhi') 
INSERT INTO Employee(EmpID,Name,Salary,Address,DeptID)VALUES(1,'Mohan',18000,'Delhi',1)
IF @@TRANCOUNT > 0
 BEGIN COMMIT TRANSACTION trans
 END
END TRY
BEGIN CATCH
 print 'Error Occured'
IF @@TRANCOUNT > 0
 BEGIN ROLLBACK TRANSACTION trans
 END
END CATCH