Option explicit we declare at the top of the script so that
we can declare every variable as Dim or other data types.
Some times we do not declare variables, in that situation it
shows error if 'option explicit' is on in the script

If we use 'Option Explicit', then we must declare the 
varible before we use.
If you dont declare the varible, then it returns an error 
message.

If you dont use 'Option Explicit' then no need of declaring 
the variables.

In VB script

option explicit forces the user to declare every variable
used in the code.

In VB Script is not mandatory to declare the variables.

VB script will be processed by windows scripthost.

Some time script host maynot haddle the undiclared 
variables.

so it is a good practice option explicit on the top of the 
script code.

once if u declare "option explicit" the each any every 
variable must be dicalred before using it in code.

other wise it fires an error nad not allow to run the 
script on Windows script host.

It is good coding practice to use "option explicit" on the 
top of the code.

byeee

Rajendra Prasad Reddy
rajendra_penumalli@yahoo.com
+919885162742
hyderabad
india

If u are using Option Explicit, then variable declaration 
in vb script becomes compulsory/mandatory.of course 
Declaration is not mandatory in Vb script

You can declare variables with the Dim, Public or the 
Private statement. Like this:

Dim myname
myname = "ritesh"

However, this method is not a good practice, because you 
can misspell the variable name later in your script, and 
that can cause strange results when your script is running.

If you misspell for example the "myname" variable 
to "mynime", the script will automatically create a new 
variable called "mynime". To prevent your script from doing 
this, you can use the 'Option Explicit' statement. This 
statement forces you to declare all your variables with the 
dim, public or private statement.

Put the Option Explicit statement on the top of your 
script. Like this:

Option Explicit
Dim myname
myname = "ritesh"