What is batch file?

Batch/.bat file 

A batch file contains a series or batches of DOS based commands, which facilitate user to run commands in a sequential manner and avoid typing of same commands again and again. All batch file commands also can be run directly over a command prompt. Many operating system other that windows may contain a shell script or command file instead of batch file.

Creating a batch file:

Creating a batch file is very simple. Create a simple text file and save as batch file by changing the extension from ".txt" to ".bat".

(Refer the below screen shot)

Write into batch file: 

Just right click and edit file into notepad. now we can write a command which is applicable over command prompt. Here I am taking a very simple example of create a directory under "C:\" drive. Type the following command into "Batch/.bat" file -

"MD c:\TestBatch" and save. Now double click on the batch file.

Execution of the batch file will create a directory named "TestBatch" under "C:\" drive. To verify this go to "C:\" drive and check for "TestBatch" directory. It should be created. So in the same manner we can also write other complex commands.