These are all programming languages which are referred to by their acronyms.
PHP - PHP: Hypertext Preprocessor
ASP - Active Server Pages
Perl - not an acronym
Each programming language has its own benefits and uses. It is best that you research on your own to find one that best fits your needs.
They are all programming languages given by their acronyms
PHP-Hypertext Processor
ASP-Active Server Pages
Perl-a porgramming language with no abbrievation
Most of the pages are designed using PHP and ASP.Well but most of the hackers use the PERL language for their activities.