welcome to the monastery BHARANI KRISHNAN,
Perl is the best language here around and Perlmonks is the sweetiest community.. but ask here is like to ask to the innkeeper if the wine is good..
Perl is a multipurpose language and with Perl you can do many many different things. It is somehow a very succint language: few keystroke to get a big effect.
Perl can run almost on every calculator you can normally have access to: it is preinstalled on most Linux distros, can run on windows (ActivePerl or even the by far preferable StrawberryPerl), mac ...
CPAN contains a big big number of Perl modules and is one of the biggest software community here around.
Take a copy of the old but still usefull Perl Cookbook to see many different complete applications presented in a recipe style.
Take your free copy of Modern Perl to have a fres look to the language.
The main Perl site hosts also a first steps tutorial
Also see a note about case: Whats-the-difference-between-perl-and-Perl ie no more PERL..
There are no rules, there are no thumbs..
Reinvent the wheel, then learn The Wheel; may be one day you reinvent one of THE WHEELS.