Keyword Driven Testing: In this testing tester interaction 
is there at time of testing. we can give the values with 
help of 

   Syntax:- Variable = inputbox("String")
       Ex:- a = inputbox("Enter the value for A ")

       In the above example a is the variable it's stores 
the value at the runtime.  and u can use this variable as a 
parameter of any object at runtime.

Data Driven Testing:  In this testing there is no 
interaction of tester.  here we can use datasheets or 
frontend grids as parameters to the application.
     We can get values from data sheets

    Syntax:- variable = datatable("column name","sheet 
name")
        Ex:- empno = datatable
("employee_no","dtGlobalSheet")

          In above example 
                 Empno is variable
                 Employee_no is column name
                 dtGlobalSheet is Sheet name

          we can use these variable in our application as a 
parameter.

Keyword Driven Testing: In this testing tester interaction 
is there at time of testing. we can give the values with 
help of 

   Syntax:- Variable = inputbox("String")
       Ex:- a = inputbox("Enter the value for A ")

       In the above example a is the variable it's stores 
the value at the runtime.  and u can use this variable as a 
parameter of any object at runtime.

Data Driven Testing:  In this testing there is no 
interaction of tester.  here we can use datasheets or 
frontend grids as parameters to the application.
     We can get values from data sheets

    Syntax:- variable = datatable("column name","sheet 
name")
        Ex:- empno = datatable
("employee_no","dtGlobalSheet")

          In above example 
                 Empno is variable
                 Employee_no is column name
                 dtGlobalSheet is Sheet name

          we can use these variable in our application as a 
parameter.

Keyword Driven Testing: In this testing tester interaction 
is there at time of testing. we can give the values with 
help of 

   Syntax:- Variable = inputbox("String")
       Ex:- a = inputbox("Enter the value for A ")

       In the above example a is the variable it's stores 
the value at the runtime.  and u can use this variable as a 
parameter of any object at runtime.

Data Driven Testing:  In this testing there is no 
interaction of tester.  here we can use datasheets or 
frontend grids as parameters to the application.
     We can get values from data sheets

    Syntax:- variable = datatable("column name","sheet 
name")
        Ex:- empno = datatable
("employee_no","dtGlobalSheet")

          In above example 
                 Empno is variable
                 Employee_no is column name
                 dtGlobalSheet is Sheet name

          we can use these variable in our application as a 
parameter.

Data-driven testing is a methodology used in Test automation
where test scripts are executed and verified based on the
data values stored in one or more central data sources or
databases. These databases can range from datapools, ODBC
sources, csv files, Excel files, DAO objects, ADO objects, etc.

Keyword-driven testing or Table-driven testing is a Software
testing methodology as part of the Test automation
discipline that separates the programming work from the
actual Test script so that the test scripts can be developed
without knowledge of programming. As a result the test
scripts can be maintained with only minor updates, even when
the application or testing requires significant changes.

Keyword-driven testing is a
technique that separates much of the programming work from 
the actual
test steps so that the test steps can be developed earlier 
and can often be
maintained with only minor updates, even when the 
application or testingUsing the keyword-driven approach, 
test automation experts have full access to the underlying 
test and object properties, via an integrated scripting and 
debugging environment that is round-trip synchronized with
the Keyword View.
needs change significantly.

key board DDT is to read values from key board
TSL stmts
create_input_dialog("message");
using for loop 
for(i=1;i<=5;i++)
{
x=create_input_dialog("enter order no");

Data driven Testing :
Data driven scripts are those application-specific scripts
captured or manually coded in the automation tool’s
proprietary language and then modified to accommodate
variable data. Variables will be used for key application
input fields and program selections allowing the script to
drive the application with external data supplied by the
calling routine or the shell that invoked the test script.
Keyword driven testing:
These tests are developed as data tables using a keyword
vocabulary that is independent of the test automation tool
used to execute them. This keyword vocabulary should also be
suitable for manual testing.
The data table records contain the keywords that describe
the actions we want to perform. They also provide any
additional data needed as input to the application, and
where appropriate, the benchmark information we use to
verify the state of our components and the application in
general.
Hope this clarifies the difference.