Teting multiple data with same script.

involves data pool concepts invariably used as data driven
testing in some tools.

supplying multiple data's to the same script to check a
desired action

driving a single test with multiple data.

you can generate multiple test scenarios using the same 
test.

For example, suppose you wants to create an account in 
yahoo for 100 or 1000 people. Like this cases we can put 
all the user information a excel file and use a single 
script. 
 
 You can create a data table by inserting values in a table 
or by importing data from an external file.

The simplest explanation of DDT is this: data that is 
external to your functional test scripts is loaded and used 
to extend your test cases. One of the best examples is that 
of a customer order form. If you wished to populate the 
entry fields with multiple test cases without DDT, you 
would either need to record multiple test scripts (one for 
each different test case) or employ DDT. To use DDT in this 
scenario, you might record a single script, entering values 
into the various fields. Then, you could alter the script 
to accept variables, entering those variables into the data 
fields. Now you can call this script each time you want to 
add an order record, passing in a new set of data each 
time.

The simplest explanation of DDT is this: data that is 
external to your functional test scripts is loaded and used 
to extend your test cases. One of the best examples is that 
of a customer order form. If you wished to populate the 
entry fields with multiple test cases without DDT, you 
would either need to record multiple test scripts (one for 
each different test case) or employ DDT. To use DDT in this 
scenario, you might record a single script, entering values 
into the various fields. Then, you could alter the script 
to accept variables, entering those variables into the data 
fields. Now you can call this script each time you want to 
add an order record, passing in a new set of data each 
time.

The simplest explanation of DDT is this: data that is 
external to your functional test scripts is loaded and used 
to extend your test cases. One of the best examples is that 
of a customer order form. If you wished to populate the 
entry fields with multiple test cases without DDT, you 
would either need to record multiple test scripts (one for 
each different test case) or employ DDT. To use DDT in this 
scenario, you might record a single script, entering values 
into the various fields. Then, you could alter the script 
to accept variables, entering those variables into the data 
fields. Now you can call this script each time you want to 
add an order record, passing in a new set of data each 
time.

data driven testing is nothing but testing the single field 
with multiple sets of data.

the main intension of this testing is to find the behaviour 
of the application for different input values.

Data Driven Testing is  used in cases where you
want to check how your application responds to ten separate 
sets of data.

Instead of one input Conducting testing with multiple 
inputs on the same module is called datadriven testing. We 
get multiple inputs for testing is in four ways. Using 
Keyboard, flat file, excel sheet and from frontend objects. 
The use of this is to check whether our application is 
working for multiple values or not. 

IF any new pls, let me know.

Data driven testing is to Test the multiple set of data 
With same Script.

Iterating a script with multiple test data is known as DDT..

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. Data-driven testing is the 
establishment of several interacting test scripts together 
with their related data results in a framework used for the 
methodology. In this framework, variables are used for both 
input values and output verification values: navigation 
through the program, reading of the data sources, and 
logging of test status and information are all coded in the 
test script. Thus, the logic executed in the script is also 
dependent on the data values.

Data Driven TEsting:- When you test your application , you 
may want to check how it performs the same operations with 
multiple sets of data.rn. And i got varius resource about 
data driven testing at macrotesting www.macrotesting.com to 
be very good source.

Regards,
Prem